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164-700: The sedimentary layers were formed in a large area named for the Green River, a tributary of the Colorado River . The three separate basins lie around the Uinta Mountains (north, east, and south) of northeastern Utah: Fossil Butte National Monument in Lincoln County, Wyoming is in a part of the formation known as Fossil Lake because of its abundance of exceptionally well preserved fish fossils . The formation of intermontane basin / lake environments during

328-565: A botanical garden, and a museum that was designed to have a national and permanent status. The former occupied space where the present Botanic Garden sits. The museum contained specimens of zoology, botany, archeology, fossils, etc., some of which were passed on to the Smithsonian Institution after its formation. The institute's charter expired in 1838, but its spirit lived on in the National Institution , founded in 1840. With

492-457: A few decades before collapsing or being washed away. Failure of the lava dams caused by erosion, leaks and cavitation caused catastrophic floods, which may have been some of the largest ever to occur in North America, rivaling the late- Pleistocene Missoula Floods of the northwestern United States. Mapping of flood deposits indicate that crests as high as 700 feet (210 m) passed through

656-563: A few notable exceptions, such as the Blackrocks reach where the river is nearly 100 feet (30 m) deep. In a few areas, such as the marshy Kawuneeche Valley near the headwaters and the Grand Valley, it exhibits braided characteristics. From Grand Junction, the Colorado turns northwest before cutting southwest across the eponymous Colorado Plateau , a vast area of high desert centered at

820-565: A large system of irrigation canals making use of the Salt River . Both civilizations supported large populations at their height, with 6,000–15,000 in Chaco Canyon and as many as 30,000–200,000 Hohokam. Puebloan and Hohokam settlements were abruptly abandoned in the 1400s CE, due both to over-exploitation of natural resources such as timber, and severe drought that made it impossible to maintain irrigation systems. Many Puebloans migrated east to

984-732: A military advantage over Goshutes and Southern Paiutes that were slower to adopt horses. The Navajo also adopted a culture of livestock herding as they acquired sheep and goats from the Spanish. Juan Bautista de Anza in 1774 was the first Spaniard to reach Yuma Crossing, where he established friendly relations with the Quechan people and opened the Anza trail between Arizona and the California coast. The Spanish soon founded Mission Puerto de Purisima Concepcion and Mission San Pedro y San Pablo de Bicuner along

1148-615: A mountain-building episode known as the Laramide orogeny . The Colorado River first formed as a west-flowing stream draining the southwestern portion of the range, and the uplift also diverted the Green River, once a tributary of the Mississippi River , west towards the Colorado. About 30 to 20 million years ago, volcanic activity related to the orogeny led to the Mid-Tertiary ignimbrite flare-up , which created smaller formations such as

1312-488: A natural occurrence of moissanite (SiC) and 23 other valid mineral species. The beds display a pronounced cyclicity , with the precession, obliquity, and eccentricity orbital components all clearly detectable. This enables the beds to be internally dated with a high degree of accuracy, and astrochronological dates agree very well with radiometric dates. Within the Green River Formation of southwest Wyoming in

1476-573: A paid, one-month internship. Pilar O'Leary launched the program when she served as executive director of the Smithsonian Latino Center. According to the Latino Center, O'Leary told the press in 2007: "Our goal is to help our Young Ambassadors become the next generation of leaders in the arts and culture fields. This program encourages students to be proud of their roots and learn more about their cultural heritage to inspire them to educate

1640-474: A route for a proposed railroad through the canyon, which was never built. We are now ready to start on our way down the Great Unknown. Our boats, tied to a common stake, are chafing each other, as they are tossed by the fretful river. They ride high and buoyant, for their loads are lighter than we could desire. We have but a month's rations remaining… The lighting of the boats has this advantage: they will ride

1804-471: A series of international and US interstate treaties known as the " Law of the River ". The US federal government constructed most of the major dams and aqueducts between 1910 and 1970; the largest, Hoover Dam , was completed in 1935. Numerous water projects have also involved state and local governments. With all of their waters fully allocated, both the Colorado and the neighboring Rio Grande are now considered among

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1968-482: A short run south, the river turns west below Grand Lake , the largest natural lake in the state. For the first 250 miles (400 km) of its course, the Colorado carves its way through the mountainous Western Slope , a sparsely populated region defined by the portion of the state west of the Continental Divide . As it flows southwest, it gains strength from many small tributaries, as well as larger ones including

2132-468: A significant distance from the river. The Puebloan people built many multi-story pueblos or "great houses", and developed complex distribution systems to supply drinking and irrigation water in Chaco Canyon in northwestern New Mexico and Mesa Verde in southwest Colorado. The Hohokam , present in the modern Phoenix area since about 0 CE, experienced prolific growth around 600-700 CE as they constructed

2296-516: A year and includes as ex officio members the chief justice of the United States and the vice president of the United States . The nominal head of the institution is the chancellor , an office which has traditionally been held by the chief justice. In September 2007, the board created the position of chair of the Board of Regents, a position currently held by Risa Lavizzo-Mourey . Other members of

2460-427: Is a group of museums , education and research centers , the largest such complex in the world, created by the U.S. government "for the increase and diffusion of knowledge." Founded on August 10, 1846, it operates as a trust instrumentality and is not formally a part of any of the three branches of the federal government . The institution is named after its founding donor, British scientist James Smithson . It

2624-523: Is at Imperial Dam , where over 90 percent of the river's flow is moved into the Gila Gravity Canal and Yuma Area Project, and the much bigger All-American Canal to irrigate California's Imperial Valley , the most productive winter agricultural region in the United States. Below Imperial Dam, only a small portion of the Colorado River makes it beyond Yuma, Arizona , and the confluence with

2788-470: Is estimated at 14.7 million acre-feet (18.1 km ), or an annualized discharge of 20,300 cu ft/s (570 m /s), for the 1906–2023 period. River flows at the Lees Ferry stream gauge, about halfway along the length of the Colorado and 16 miles (26 km) below Glen Canyon Dam, are used to determine water allocations in the Colorado River basin. Flows originating above Lees Ferry represent

2952-463: Is interested, might be interested or ought to be interested". Another Secretary of the Smithsonian, Walter Boyne, founded Air & Space . The organization publishes under the imprints Smithsonian Institution Press, Smithsonian Books, and Smithsonian Institution Scholarly Press. The Smithsonian makes a number of awards to acknowledge and support meritorious work. The Smithsonian Institution

3116-404: Is now called the Green River Formation are in the journals of early missionaries and explorers such as S. A. Parker, 1840, and J. C. Fremont, 1845. Geologist Dr. John Evans collected the first fossil fish, described as Clupea humilis (later renamed Knightia eocaena ), from the Green River beds in 1856. Edward Drinker Cope collected extensively from the area and produced several publications on

3280-760: Is now known as the Long Walk and while enduring appalling conditions at Fort Sumner. After the failure of the Army to maintain the reservation there, the Treaty of Bosque Redondo established the Navajo Nation in the Four Corners, where the Navajo were allowed to return in 1868. Gold and silver were also discovered in the Upper Basin, beginning with the 1859 Blue River strike that led to

3444-549: Is one of the principal rivers (along with the Rio Grande ) in the Southwestern United States and in northern Mexico . The 1,450-mile-long (2,330 km) river, the 5th longest in the United States , drains an expansive, arid watershed that encompasses parts of seven U.S. states and two Mexican states. The name Colorado derives from the Spanish language for "colored reddish" due to its heavy silt load. Starting in

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3608-736: Is only 2–3 percent of the entire basin. Urban areas cover less than 1 percent. Climate in the Colorado River Basin ranges from subtropical hot desert at southern, lower elevations to alpine in the Rocky Mountains. Mean monthly high temperatures are 25.3 °C (77.5 °F) in the Upper Basin and 33.4 °C (92.1 °F) in the Lower Basin, and lows average −3.6 and 8.9 °C (25.5 and 48.0 °F), respectively. Annual precipitation averages 6.5 inches (164 mm), ranging from over 60 inches (1,500 mm) in some areas of

3772-569: Is owned by Union Pacific . As late as 1921, the Colorado River upstream from the confluence with the Green River in Utah was still known as the Grand River. For over a decade, U.S. Representative Edward T. Taylor of Colorado had petitioned the Congressional Committee on Interstate and Foreign Commerce to rename the Grand River as the Colorado River. Representatives from Wyoming, Utah, and

3936-558: Is significantly more pronounced in the Lower Basin, where it has a strong impact on monsoonal rainfall. Runoff patterns across the Colorado River Basin reflect this; most of the perennial tributaries originate in the Upper Basin, while tributaries in the Lower Basin are either ephemeral (such as the Little Colorado River) or highly seasonal (such as the Gila and Salt rivers). As of 2010, approximately 13 million people lived within

4100-501: Is strictly found in Fossil lake only, while Erismatopterus is uncommon in Lake Uinta but common in certain mass mortality layers of Lake Gosiute and absent from Fossil Lake. The various fossil beds of the Green River Formation span a 5 million year period, dating to between 53.5 and 48.5 million years old. This span of time includes the transition between the moist early Eocene climate and

4264-535: Is the second longest and drains a greater area than the Green, but has a significantly lower flow because of a more arid climate and larger diversions for irrigation and cities. Both the Gunnison and San Juan rivers, which derive most of their water from Rocky Mountains snowmelt, contribute more water than the Gila contributed naturally. The Colorado River Basin consists of 246,000 square miles (640,000 km ), making it

4428-709: Is unknown. The Grand River above the confluence with the Gunnison River was also called the Bunkara River, the Blue River, or the North Fork of the Grand River until the 1870s. By the early 1900s the name "Grand River" had been attached to the entire stream as far as Grand Lake, which was then considered its official source. Although the Grand River was renamed the Colorado in 1921, its name survives in numerous places such as Grand County and Grand Junction, Colorado. In 1848

4592-565: The Baja California – Sonora border. Since 1960, the stretch of the Colorado between here and the Gulf of California has been dry or a trickle formed by irrigation return flows. The Hardy River provides most of the flow into the Colorado River Delta , a vast alluvial floodplain covering about 3,000 square miles (7,800 km ) of northwestern Mexico. A large estuary is formed here before

4756-591: The Blue , Eagle and Roaring Fork rivers. After passing through De Beque Canyon , the Colorado emerges from the Rockies into the Grand Valley , a major farming and ranching region where it meets one of its largest tributaries, the Gunnison River , at Grand Junction . Most of the upper river is a swift whitewater stream ranging from 200 to 500 feet (60 to 150 m) wide, the depth ranging from 6 to 30 feet (2 to 9 m), with

4920-593: The Chiricahua Mountains in Arizona and deposited massive amounts of volcanic ash and debris over the watershed. The Colorado Plateau first began to rise during the Eocene , between about 55 and 34 million years ago, but did not attain its present height until about 5 million years ago, about when the Colorado River established its present course into the Gulf of California. The time scale and sequence over which

5084-634: The Colorado River Indian Tribes . As the American frontier expanded into the Colorado Plateau, an effort to expel the Navajo from the Four Corners region was begun by General James Henry Carleton , who in 1864 enlisted mountain man Kit Carson to lead a campaign against the Navajo. Carson, with the help of the Navajo's Ute enemies, captured more than 8,000 Navajo and forcibly marched them to Fort Sumner , New Mexico. Hundreds died during what

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5248-614: The Four Corners of the southwestern United States. Here, the climate becomes significantly drier than that in the Rocky Mountains, and the river becomes entrenched in progressively deeper gorges of bare rock, beginning with Ruby Canyon and then Westwater Canyon as it enters Utah , now once again heading southwest. Farther downstream it receives the Dolores River and defines the southern border of Arches National Park , before passing Moab and flowing through "The Portal", where it exits

5412-544: The Fremont culture period (0–1300 CE). The Ancient Puebloan culture, also known as Anasazi or Hisatsinom, were descended from the Desert Archaic culture and became established in the Four Corners region around 1000 CE. While there is much evidence of ancient habitation along the Colorado River, including stone dwellings, petroglyphs and pottery in places such as Glen Canyon, the first major agriculture-based societies arose

5576-766: The Grand Mesa ; the Weenuchiu lived along the San Juan River, and the Parianuche and Yamparika lived in the Yampa, White and Duchesne River valleys. The Ute ranged as far as the river’s headwaters; one Ute story recounts a battle with the Arapaho at Grand Lake, which they believe still hosts the spirits of the deceased. Starting in the 1500s, the Spanish began to explore and colonize western North America. Francisco de Ulloa may have been

5740-611: The Great Salt Lake and Sevier Lake watersheds. To the south, the Colorado River Basin borders several watersheds in Mexico draining into the Gulf of California, including the Sonoyta , Concepción , and Yaqui rivers. Much of the basin is at high elevation; the mean elevation is 5,500 feet (1,700 m). Lees Ferry, more than halfway along the Colorado River from its source, is 3,150 feet (960 m) above sea level. The highest point in

5904-533: The Marquis de Lafayette . Operating expenses were covered from the $ 5 yearly dues collected from each member. The institute proposed a number of undertakings. These included the study of plant life and the creation of a botanical garden on the Capitol Mall , an examination of the country's mineral production, improvement in the management and care of livestock, and the writing of a topographical and statistical history of

6068-602: The Mogollon Rim in central Arizona. These high plateaus and escarpments, often exceeding 9,000 feet (2,700 m) in elevation, form the northern and southern edges of the Colorado Plateau geological province. Developed land use in the basin is mostly irrigated agriculture, chiefly in the Grand Valley , the Lower Colorado River Valley , and the Salt River Valley , but the total area of crop and pasture land

6232-522: The Monterey submarine canyon . Crustal extension in the Basin and Range Province began about 20 million years ago and the modern Sierra Nevada began forming about 10 million years ago, eventually diverting the Colorado southwards towards the Gulf. As the Colorado Plateau continued to rise between 5 and 2.5 million years ago, the river maintained its ancestral course (as an antecedent stream ) and began to cut

6396-737: The National Museum of African Art and the Arthur M. Sackler Gallery opened in a new, joint, underground museum between the Freer Gallery and the Smithsonian Castle. Reuse of another old building came in 1993 with the opening of the National Postal Museum in the 1904 former City Post Office building, a few city blocks from the Mall. In 2004, the Smithsonian opened the National Museum of

6560-639: The National Museum of African Art , as well as the National Gallery of Art , were formally returned to Nigerian cultural officials in a ceremony held in Washington D.C. The Nigerian Minister of Information and Culture, Lai Mohammed , and Prince Aghatise Erediauwa, representing the Oba of Benin Kingdom, spoke at the ceremony. Mohammed said the "decision to return the timeless artworks is worth emulating." In February 2020,

6724-540: The Navajo settled in the Colorado Basin after the 1000s. In the 1500s, Spanish explorers began mapping and claiming the watershed, which became part of Mexico upon winning its independence from Spain in 1821. Even after most of the watershed became US territory in 1846, much of the river's course remained unknown. Several expeditions charted the Colorado in the mid-19th century—one of which, led by John Wesley Powell ,

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6888-434: The Renwick Gallery . A smaller amount of funds would go to educational initiatives and digitization of collections. As of September 2017, the Smithsonian claimed to have raised $ 1.79 billion, with three months left in the formal campaign calendar. Separately from the major capital campaign, the Smithsonian has begun fundraising through Kickstarter . An example is a campaign to fund the preservation and maintenance of

7052-407: The Smithsonian American Women's History Museum . In 2011, the Smithsonian undertook its first-ever capital fundraising campaign. The $ 1.5 billion effort raised $ 1 billion at the three-year mark. Smithsonian officials made the campaign public in October 2014 in an effort to raise the remaining $ 500 million. More than 60,000 individuals and organizations donated money to the campaign by

7216-425: The South Pacific Ocean . These specimens and artifacts became part of the Smithsonian collections, as did those collected by several military and civilian surveys of the American West , including the Mexican Boundary Survey and Pacific Railroad Surveys , which assembled many Native American artifacts and natural history specimens. In 1846, the regents developed a plan for weather observation; in 1847, money

7380-427: The Southern Paiute ) and the Kumeyaay inhabited the desert to the river’s west. Those living along the lower Colorado River depended more on fishing and floodplain agriculture than on irrigation, and mostly did not live in permanent settlements. The site of modern-day Yuma has been an important river crossing since ancient times, as the channel here is much narrower compared to the expansive, swampy river bottoms to

7544-418: The United States Geological Survey objected, noting that the Green River was longer and drained a larger area. Taylor argued that the Grand River should be considered the main stream, as it carried the larger volume of water. Taylor felt “slighted” that the Colorado River, as named, did not begin in the state of Colorado, and “he wasn’t going to let Utah or Wyoming lay claim to the river’s headwaters, despite

7708-403: The deaccession and restitution of items collected under circumstances considered unethical by contemporary standards and thus places moral over legal arguments. A month before, the Smithsonian's National Museum of African Art had announced the planned return of most of its 39 Benin Bronzes to Nigeria , as well as of other cultural items to Turkey . On October 11, 2022, Benin Bronzes from

7872-403: The privilege of the floor at the United States Senate . On September 18, 2013, Secretary G. Wayne Clough announced he would retire in October 2014. The Smithsonian Board of Regents said it asked regent John McCarter, Jr., to lead a search committee. On March 10, 2014, the Smithsonian Board selected David Skorton , a physician and president of Cornell University , as the thirteenth secretary of

8036-679: The ruby slippers worn by Judy Garland for her role as Dorothy Gale in the 1939 film The Wizard of Oz . Nineteen museums and galleries, as well as the National Zoological Park , comprise the Smithsonian museums. Eleven are on the National Mall , the park that runs between the Lincoln Memorial and the United States Capitol . Other museums are located elsewhere in Washington, D.C., with two more in New York City and one in Chantilly, Virginia . The Smithsonian has close ties with 168 other museums in 39 states, Panama , and Puerto Rico . These museums are known as Smithsonian Affiliated museums. Collections of artifacts are given to these museums in

8200-466: The 1500s. Navajo Mountain and Rainbow Bridge in the Glen Canyon area came to hold particular religious significance for the Navajo, and the nearby confluence of the Colorado and San Juan River is regarded as the birthplace of clouds and rain. The Ute also became established in the Colorado Plateau around 1500 CE, although they had inhabited more northerly parts of the Colorado basin (modern Wyoming and northern Colorado) since at least 0 CE. They are

8364-411: The American Indian in a new building near the United States Capitol . Twelve years later almost to the day, in 2016, the latest museum opened: the National Museum of African American History and Culture , in a new building near the Washington Monument . Two more museums have been established and are being planned for eventual construction on the mall: the National Museum of the American Latino and

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8528-562: The Arizona–Nevada and Arizona– California borders. After leaving the confines of the Black Canyon , the river emerges from the Colorado Plateau into the Lower Colorado River Valley (LCRV), a desert region dependent on irrigation agriculture and tourism and also home to several major Indian reservations . The river widens here to a broad, moderately deep waterway averaging 500 to 1,000 feet (150 to 300 m) wide and reaching up to 0.25 miles (400 m) across, with depths ranging from 8 to 60 feet (2 to 20 m). Before channelization of

8692-410: The Army had driven out the remaining pockets of Ute resistance on the Western Slope, officially opening the Grand River country to settlement, and the town of Grand Junction was incorporated a year later. The Denver and Rio Grande Western Railroad (D&RGW) quickly expanded into this area to serve mining boomtowns, crossing the Rockies to the south via the Black Canyon of the Gunnison River . By 1883

8856-406: The Board of Regents are three members of the U.S. House of Representatives appointed by the speaker of the House ; three members of the Senate, appointed by the president pro tempore of the Senate ; and nine citizen members, nominated by the board and approved by the Congress in a joint resolution signed by the president of the United States. Regents who are senators or representatives serve for

9020-435: The Colorado River Basin is 14,321-foot (4,365 m) Uncompahgre Peak in Colorado's San Juan Mountains , while some water from the river drains via irrigation run-off into California's Salton Sea , 236 feet (72 m) below sea level. About 72 percent of the Colorado River Basin is classified as arid, with the Sonoran and Mojave deserts covering the southern portion and the Colorado Plateau encompassing much of

9184-401: The Colorado River Basin. Other significant cities include Tucson, Arizona , St. George, Utah and Flagstaff, Arizona . Due to the rugged and inhospitable topography through which the river flows, there are only a few major towns along the Colorado River itself, including Grand Junction, Colorado and Yuma, Arizona . The unimpaired annual runoff of the Colorado River at Lees Ferry, Arizona

9348-408: The Colorado River Delta almost entirely dry except for small amounts of agricultural wastewater. As recently as the Cretaceous period about 100 million years ago, much of western North America was still part of the Pacific Ocean . Tectonic forces from the collision of the Farallon Plate with the North American Plate pushed up the Rocky Mountains between 50 and 75 million years ago in

9512-549: The Colorado River Delta prior to the early 20th century. Up to 90 percent of the river's flow originates as snowmelt from the Rocky Mountains and other smaller mountain ranges of the Colorado Plateau. Natural seasonal flows at its mouth varied widely, often exceeding 100,000 cu ft/s (2,800 m /s) in the spring melt and falling as low as 2,500 cu ft/s (71 m /s) in winter. Snowmelt typically begins in April, peaks in May or June, and can extend into August in wet years. Monsoon rainstorms often occur in

9676-405: The Colorado River Delta, the basin extends into Sonora at a few locations further east, including the headwaters of the Santa Cruz River and San Pedro River (both tributaries of the Gila River). For hydrological management purposes, the Colorado River Basin is divided into the Upper Basin (the drainage area above Lees Ferry), and the Lower Basin . The Upper Basin covers only 45 percent of

9840-419: The Colorado River and its tributaries are a vital source of water for 40 million people. An extensive system of dams , reservoirs, and aqueducts divert almost its entire flow for agricultural irrigation and urban water supply. Its large flow and steep gradient are used to generate hydroelectricity , meeting peaking power demands in much of the Intermountain West . Intensive water consumption has dried up

10004-424: The Colorado River basin, while about 40 million people live in areas supplied by Colorado River water. Colorado River basin states are among the fastest-growing in the US; the population of Nevada alone increased by about 66 percent between 1990 and 2000 as Arizona grew by some 40 percent. Phoenix, Arizona , Las Vegas, Nevada and Mexicali, Baja California are the largest cities by population within

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10168-425: The Colorado River near the junction with the Dolores River , naming the larger river “Rio San Rafael”. They later forded the Colorado in southeastern Utah at Crossing of the Fathers , now submerged in Lake Powell. In the 1820s, American fur trappers along the upper Green River in Wyoming (known to them as the "Seedskeedee" or variants thereof), seeking a route to export furs to the coast, surmised that this and what

10332-485: The Colorado empties into the Gulf about 75 miles (120 km) south of Yuma. Occasionally the International Boundary and Water Commission allows a springtime pulse flow to recharge the delta. Before 20th-century development dewatered the lower Colorado, a major tidal bore was present in the delta and estuary; the first historical record was made by the Croatian missionary in Spanish service Father Ferdinand Konščak on July 18, 1746. During spring tide conditions,

10496-416: The Colorado enters Cataract Canyon , named for its dangerous rapids, and then Glen Canyon , known for its arches and erosion-sculpted Navajo sandstone formations. Here, the San Juan River , carrying runoff from the southern slope of Colorado's San Juan Mountains , joins the Colorado from the east. The Colorado then enters northern Arizona , where since the 1960s Glen Canyon Dam near Page has flooded

10660-434: The Colorado in the 20th century, the lower river was subject to frequent course changes caused by seasonal flow variations. Joseph C. Ives , who surveyed the lower river in 1861, wrote that "the shifting of the channel, the banks, the islands, the bars is so continual and rapid that a detailed description, derived from the experiences of one trip, would be found incorrect, not only during the subsequent year, but perhaps in

10824-400: The Continental Divide, but ran out of money before even reaching Utah. In 1931 the D&RGW completed the "Dotsero Cutoff" linking Glenwood Springs to the D&SL route at Bond, Colorado , finally completing the direct Denver–Salt Lake link with its acquisition of the bankrupt D&SL. The Gunnison River route was eventually abandoned in favor of the shorter Colorado River route, which today

10988-405: The Eocene resulted from mountain building and uplift of the Rocky Mountains (late Cretaceous Sevier orogeny and the Paleogene Laramide orogeny ). Tectonic highlands supplied the Eocene sedimentary basins with sediment from all directions: the Uinta Mountains in the center; the Wind River Mountains to the north; the Front Range , Park Range and Sawatch Range of the Colorado Rockies to

11152-493: The GDP at the time it may be more comparable to $ 220 million in the year 2007. Once the money was in hand, eight years of congressional haggling ensued over how to interpret Smithson's rather vague mandate "for the increase and diffusion of knowledge." The money was invested by the US Treasury in bonds issued by the state of Arkansas, which soon defaulted. After heated debate, Massachusetts representative (and former president) John Quincy Adams persuaded Congress to restore

11316-413: The Glen Canyon reach of the river, forming Lake Powell for hydroelectricity generation. In Arizona, the river passes Lee's Ferry , an important crossing for early explorers and settlers and since the early 20th century the principal point where Colorado River flows are measured for apportionment to the seven U.S. and two Mexican states in the basin. Downstream, the river enters Marble Canyon ,

11480-454: The Grand Canyon, reaching peak discharges as great as 17 million cubic feet per second (480,000 m /s). Small numbers of Paleo-Indians of the Clovis and Folsom cultures inhabited the Colorado Plateau as early as 10,000 BCE, with populations beginning to increase in the Desert Archaic period (6000 BCE–0 CE). While most early inhabitants were hunter-gatherers, evidence of agriculture, masonry dwellings and petroglyphs begins with

11644-412: The Grand Canyon. Antecedence played a major part in shaping other peculiar geographic features in the watershed, including the Dolores River's bisection of Paradox Valley in Colorado and the Green River's cut through the Uinta Mountains in Utah. Sediments carried from the plateau by the Colorado River created a vast delta made of more than 10,000 cubic miles (42,000 km ) of material that walled off

11808-467: The Grand Canyon. At least 13 lava dams were formed, the largest of which was more than 2,300 feet (700 m) high, backing the river up for nearly 500 miles (800 km) to present-day Moab, Utah. The lack of associated sediment deposits along this stretch of the Colorado River, which would have accumulated in the impounded lakes over time, suggests that most of these dams did not survive for more than

11972-621: The Green River Formation are housed at the Smithsonian Institution in Washington, D.C. Fish fossils of Diplomystus and Knightia are found in Fossil Lake but not in Lake Gosiute. Only Lake Gosiute has fossils of catfish ( Ictaluridae and Hypsidoridae ) and suckers ( Catostomidae ). The catfish are found mostly in the deepest parts of the lake. Percopsid sand-roller relatives are known from all three lakes, however Amphiplaga

12136-508: The Lower Basin from August through October, contributing much of the flow in tributaries below Lees Ferry and often causing flash flooding . Since the initial closure of Hoover Dam in 1934, lower Colorado River flows have been greatly moderated, with monthly means below the dam ranging from 16,400 cu ft/s (460 m /s) in May to 11,200 cu ft/s (320 m /s) in October. Upstream of

12300-634: The Moab Valley between a pair of 1,000-foot (300 m) sandstone cliffs. In Utah, the Colorado flows primarily through the " slickrock " country, which is characterized by its narrow canyons and unique "folds" created by the tilting of sedimentary rock layers along faults. This is one of the most inaccessible regions of the continental United States. Below the confluence with the Green River , its largest tributary, in Canyonlands National Park ,

12464-503: The National Museum of African-American Heritage and Culture. The opening of the center was prompted, in part, by the publishing of a report called "Willful Neglect: The Smithsonian and U.S. Latinos". According to documents obtained by The Washington Post , when former Latino Center executive director Pilar O'Leary first took the job, the center faced employees who had "serious performance issues". No performance plans existed for

12628-609: The Rio Grande Valley, while others persisted in smaller settlements on the Colorado Plateau. Puebloan descendants include the Hopi , Zuni , Laguna and Acoma peoples of modern Arizona and New Mexico. O'odham peoples, including the Akimel O'odham (Pima) and Maricopa who continue to live in southern Arizona, are believed to be descended from the Hohokam. The lower Colorado River valley

12792-622: The Rockies to less than 4 inches (100 mm) in dry desert valleys. The Upper Basin generally receives snow and rain during the winter and early spring, while precipitation in the Lower Basin falls mainly during intense but infrequent summer thunderstorms brought on by the North American Monsoon . Precipitation is influenced by the El Niño-Southern Oscillation (ENSO) with El Niño being associated with wetter conditions and La Niña with drier conditions. The effect of ENSO

12956-522: The Rockies. Water diversions have effectively removed some tributaries entirely, including the Gila River, once the Colorado's largest tributary below Lees Ferry. Most Colorado River water is diverted in the United States, with only about 2.8 million acre-feet (3.5 km ) per year reaching Mexico since 1950. At Morelos Dam, the remaining flow is diverted to irrigate the Mexicali Valley, leaving

13120-480: The Smithsonian Libraries and Smithsonian Archives merged into one research center in 2020. The Smithsonian Institution includes three cultural centers among its units: In 1997, the Smithsonian Latino Center was created as a way to recognize Latinos across the Smithsonian Institution. The primary purpose of the center is to place Latino contributions to the arts, history, science, and national culture across

13284-635: The Smithsonian and funds to build the museum to hold it (which was named the Freer Gallery ), it was among the Smithsonian's first major donations from a private individual. The gallery opened in 1923. More than 40 years would pass before the next museum, the Museum of History and Technology (renamed the National Museum of American History in 1980), opened in 1964. It was designed by the world-renowned firm of McKim, Mead & White . The Anacostia Community Museum , an "experimental store-front" museum created at

13448-495: The Smithsonian made 2.8 million digital items available to the public under a Creative Commons Zero Public Domain Dedication, with a commitment to release further items in the future. The Smithsonian has eight research centers, located in Washington, D.C.; Front Royal, Virginia ; Edgewater, Maryland ; Suitland, Maryland ; Fort Pierce, Florida ; Cambridge, Massachusetts ; and Panama . Formerly two separate entities,

13612-671: The Smithsonian's Department of Living Animals. The park was designed by landscape architect Frederick Law Olmsted . The National Museum of Natural History opened in June 1911 to similarly accommodate the Smithsonian's United States National Museum, which had previously been housed in the Castle and then the Arts and Industries Building. This structure was designed by the D.C. architectural firm of Hornblower & Marshall . When Detroit philanthropist Charles Lang Freer donated his private collection to

13776-469: The Smithsonian's museums and research centers. The center is a division of the Smithsonian Institution. As of May 2016, the center is run by an executive director, Eduardo Díaz. At the time of its creation, the Smithsonian Institution had other entities dedicated to other minority groups: National Museum of the American Indian, Freer-Sackler Gallery for Asian Arts and Culture, African Art Museum, and

13940-476: The Smithsonian, slightly increased from previous years. Institution exhibits are free of charge, though in 2010 the Deficit Commission recommended admission fees. As approved by Congress on August 10, 1846, the legislation that created the Smithsonian Institution called for the creation of a Board of Regents to govern and administer the organization. This seventeen-member board meets at least four times

14104-532: The Smithsonian. Though the Smithsonian's first secretary, Joseph Henry , wanted the institution to be a center for scientific research, it also became the depository for various Washington and U.S. government collections. The United States Exploring Expedition by the U.S. Navy circumnavigated the globe between 1838 and 1842. The voyage amassed thousands of animal specimens, an herbarium of 50,000 plant specimens, and diverse shells and minerals, tropical birds, jars of seawater, and ethnographic artifacts from

14268-529: The Spanish called the Colorado were in fact connected. William H. Ashley made an unsuccessful attempt to navigate from the Green River to the Colorado's mouth in 1825. In 1826, Jedediah Smith arrived at the lower Colorado River, referring to it as the Seedskeedee, and proceeded upstream, exploring as far as Black Canyon. During the 1830s, various fur trappers from Wyoming made it as far downstream as Cataract Canyon and Glen Canyon, but none were able to navigate

14432-485: The U.S. Army established Fort Yuma , creating the first permanent U.S. settlement along the river. This served as a military garrison and supply point for settlers headed to California along the Southern Emigrant Trail . Due to the arduous task of ferrying supplies overland, the schooner Invincible attempted to bring supplies up the river but was thwarted by the delta’s strong tides. Steamboats were brought to

14596-638: The Uinta highland and the Rocky Mountains to the east and north. The lagerstätten formed in anoxic conditions in the fine carbonate muds that formed in the lakebeds. Lack of oxygen slowed bacterial decomposition and kept scavengers away, so leaves of palms, ferns and sycamores, some showing the insect damage they had sustained during their growth, were covered with fine-grained sediment and preserved. Insects were preserved whole, even delicate wing membranes and spider spinnerets. Vertebrates were preserved too, including

14760-576: The United States. Reports were to be published periodically to share this knowledge with the greater public, but due to a lack of funds, this initially did not occur. The institute first met in Blodget's Hotel, later in the Treasury Department and City Hall, before being assigned a permanent home in 1824 in the Capitol building. Beginning in 1825, weekly sittings were arranged during sessions of Congress for

14924-608: The Virgin River, enabled shipping of their produce by wagon to gold mining districts further south. Although the Mormons abandoned St. Thomas in 1871, a salt-mining industry persisted here, and steamboats operated up to nearby Rioville into the 1880s. In 1879 a group of Mormon settlers made their way to southeastern Utah, blasting the precarious Hole in the Rock Trail to cross the Colorado River at Glen Canyon, subsequently establishing

15088-521: The area known as Fossil Lake , two distinct zones of very fine-grained lime muds are particularly noted for preserving a variety of complete and detailed fossils . These layers are an Eocene Lagerstätte , a rare place where conditions were right for a rich accumulation of undisturbed fossils. The most productive zone—called the split fish layer —consists of a series of laminated or varved lime muds about 6 ft (1.8 m) thick, which contains abundant fish and other fossils. These are easily split along

15252-620: The beginning of the Grand Canyon , passing under the Navajo Bridges on a now southward course. Below the confluence with the Little Colorado River , the river swings west into Granite Gorge, the most dramatic portion of the Grand Canyon, where the river cuts up to one mile (1.6 km) into the Colorado Plateau, exposing some of the oldest visible rocks on Earth, dating as long ago as 2 billion years. The 277 miles (446 km) of

15416-656: The central Rocky Mountains of Colorado , it flows generally southwest across the Colorado Plateau and through the Grand Canyon before reaching Lake Mead on the Arizona – Nevada border, where it turns south toward the international border . After entering Mexico, the Colorado approaches the mostly dry Colorado River Delta at the tip of the Gulf of California between Baja California and Sonora . Known for its dramatic canyons, whitewater rapids, and eleven U.S. National Parks ,

15580-464: The central portion. The Colorado Plateau is home to most of the major canyon systems formed by the Colorado River and its tributaries, particularly those of the Green and San Juan rivers. About 23 percent of the basin is forest, with the largest area in the Rocky Mountains; other significant forested areas include the Kaibab , Aquarius , and Markagunt plateaus in southern Utah and northern Arizona, and

15744-432: The channel, we know not; what walls rise over the river, we know not; Ah, well! we may conjecture many things. The men talk as cheerfully as ever; jests are bandied about freely this morning; but to me the cheer is somber and the jests are ghastly. In 1858, gold was discovered on the Gila River east of Yuma, then along the Colorado River at El Dorado Canyon, Nevada and La Paz, Arizona . As prospectors and settlers entered

15908-576: The community of Bluff . Due to the dry climate, these settlements depended heavily on irrigation. In central Arizona, settlers uncovered and re-established canals previously used by the Hohokam. Following tensions between Mormon settlers and the U.S. government in the Utah War , a local militia including John D. Lee perpetrated the 1857 Mountain Meadows Massacre , in which 120 non-Mormon settlers were killed. Fearing retribution, Lee moved in 1870 to

16072-601: The construction of the Arts and Industries Building in 1881. Congress had promised to build a new structure for the museum if the 1876 Philadelphia Centennial Exposition generated enough income. It did, and the building was designed by architects Adolf Cluss and Paul Schulze, based on original plans developed by Major General Montgomery C. Meigs of the United States Army Corps of Engineers . It opened in 1881. The National Zoological Park opened in 1889 to accommodate

16236-454: The course of a week, or even a day." The LCRV is one of the most densely populated areas along the river, and there are numerous towns including Bullhead City, Arizona , Needles, California , and Lake Havasu City, Arizona . Here, several large diversions draw from the river, providing water for both local uses and distant regions including the Salt River Valley of Arizona and metropolitan Southern California . The last major U.S. diversion

16400-528: The dam is an integral component for management of the Colorado River, controlling floods and storing water for farms and cities in the lower Colorado River basin. Below the dam the river passes under the Mike O'Callaghan–Pat Tillman Memorial Bridge —which at nearly 900 feet (270 m) above the water is the highest concrete arch bridge in the Western Hemisphere —and then turns due south towards Mexico, defining

16564-425: The dog-sized Meniscotherium and Notharctus , one of the first primates. The earliest bats known from complete skeletons ( Icaronycteris index , I. gunnelli , [1] and Onychonycteris finneyi ), already full-developed for flight, are found here. Even a snake, Boavus idelmani , found its way into a lake and was preserved in the mudstone. The first documented records of (invertebrate) fossils from what

16728-401: The duration of their elected terms, while citizen Regents serve a maximum of two six-year terms. Regents are compensated on a part-time basis. The chief executive officer (CEO) of the Smithsonian is the secretary, who is appointed by the Board of Regents. The secretary also serves as secretary to the Board of Regents but is not a voting member of that body. The secretary of the Smithsonian has

16892-573: The east side of the divide drain into the Mississippi River and Rio Grande , while nearby areas north of the Wind River Range drain into the Columbia River . The western boundary of the Colorado River Basin is formed by various ranges and plateaus that border the Great Basin , including the Uinta Mountains and Wasatch Range . Major Great Basin watersheds bordering the Colorado River Basin are

17056-590: The east; the Uncompahgre Plateau and the San Juan Mountains to the south and finally, the Wasatch Mountains of Utah and the ranges of eastern Idaho to the west. The lithology of the lake sediments is varied and includes sandstones , mudstones , siltstones , oil shales , coal beds, saline evaporite beds, and a variety of lacustrine limestones and dolomites . Volcanic ash layers within

17220-436: The estimates of recoverable oil has been questioned, back in 2013, by geophysicist Raymond T. Pierrehumbert, who argued that the technology for recovering oil from the Green River oil shale deposit had not been developed and had not been profitably implemented at any significant scale. Green River oil shale is lacustrine type lamosite . The organic matter is from blue-green algae (cyanobacteria) . The unusual chemistry of

17384-453: The fact that the Green River is the larger drainage basin.” On July 25, 1921, President Warren G. Harding signed House Joint Resolution 32 - “To change the name of the Grand River in Colorado and Utah to the Colorado River.” Smithsonian Institution The Smithsonian Institution ( / s m ɪ θ ˈ s oʊ n i ə n / smith- SOH -nee-ən ), or simply the Smithsonian ,

17548-509: The ferry obsolete. The Denver and Salt Lake Railway (D&SL), incorporated in 1902, sought to provide a more direct connection between Denver and Salt Lake City than either the transcontinental railroad through Wyoming or the D&;RGW’s route via Black Canyon and Durango. The D&SL completed a rail line into the upper headwaters of the Colorado River and blasted the Moffat Tunnel under

17712-462: The first European to see the river, when in 1536 he sailed to the head of the Gulf of California. In 1540 García López de Cárdenas became the first European to see the Grand Canyon, during Coronado 's expedition to find the Seven Cities of Gold ("Cibola"). Cárdenas was apparently unimpressed with the canyon, greatly underestimating its size, and left in disappointment with no gold to be found. In

17876-408: The first known inhabitants of this part of the Rocky Mountains, and made use of an extensive network of trails crisscrossing the mountains to move between summer and winter camps. The Ute were divided into numerous bands with separate territories but shared a common language and customs. The Uncompahgre or Tabeguache lived around the confluence of the upper Colorado and Gunnison Rivers, an area including

18040-452: The first part of non-natives to travel the length of the Grand Canyon, and the first to successfully travel by boat from the upper Green River to the lower Colorado. Powell led a second expedition in 1871, with financial backing from the U.S. government, and continued to conduct geographical and botanical surveys across the region until the 1890s. Another Grand Canyon river expedition was led in 1889-1890 by Robert Brewster Stanton to survey

18204-924: The form of long-term loans. The Smithsonian also has a large number of traveling exhibitions, operated through the Smithsonian Institution Traveling Exhibition Service (SITES). In 2008, 58 of these traveling exhibitions went to 510 venues across the country. Smithsonian collections include 156 million artworks, artifacts, and specimens. The National Museum of Natural History houses 145 million of these specimens and artifacts, which are mostly animals preserved in formaldehyde. The Collections Search Center has 9.9 million digital records available online. The Smithsonian Institution Libraries hold 2 million library volumes. Smithsonian Archives hold 156,830 cubic feet (4,441 m ) of archival material. The Smithsonian Institution has many categories of displays that can be visited at

18368-648: The fossil fish from 1870 onwards. Ferdinand Vandeveer Hayden (geologist-in-charge of the United States Geological and Geographical Survey of the Territories, the forerunner of the United States Geological Survey ) first used the name "Green River Shales" for the fossil sites in 1869. Millions of fish fossils have been collected from the area, commercial collectors operating from legal quarries on state and private land have been responsible for

18532-577: The founding of Breckenridge, Colorado . Up until the 1860s, southwestern Colorado had remained relatively untouched by U.S. westward expansion, as the Americans had recognized Ute sovereignty by treaty. Following the 1861 carving out of Colorado Territory and further mineral strikes including Ouray and Telluride , Ute leaders were coerced into signing the 1873 Brunot Agreement , in which they lost rights to most of their land. A flood of mineral prospecting and settlement ensued in western Colorado. By 1881,

18696-479: The full length of the river. In 1843 John C. Frémont explored the Great Basin and conclusively determined no Buenaventura River flowed west to California; thus, the direction of river flow must be southwest. By the early 19th century, the stretch of the Colorado above the confluence of the Green River at Cataract Canyon , Utah, became known to fur trappers as the "Grand River", though the exact origin of this name

18860-812: The initiative of Smithsonian Secretary S. Dillon Ripley , opened in the Anacostia neighborhood of Washington, D.C., in 1967. That same year, the Smithsonian signed an agreement to take over the Cooper Union Museum for the Arts of Decoration (now the Cooper Hewitt, Smithsonian Design Museum ). The National Portrait Gallery and the Smithsonian American Art Museum opened in the Old Patent Office Building (built in 1867) on October 7, 1968. The reuse of an older building continued with

19024-550: The institution's 30 million annual visitors are admitted without charge, the exception being Cooper Hewitt, Smithsonian Design Museum in New York City, which charges an admissions fee. The Smithsonian's annual budget is around $ 1.25 billion, with two-thirds coming from annual federal appropriations. Other funding comes from the institution's endowment , private and corporate contributions, membership dues, and earned retail, concession, and licensing revenue. As of 2021,

19188-538: The institution's endowment had a total value of about $ 5.4 billion. In many ways, the origin of the Smithsonian Institution can be traced to a group of Washington citizens who, being "impressed with the importance of forming an association for promoting useful knowledge," met on June 28, 1816, to establish the Columbian Institute for the Promotion of Arts and Sciences . Officers were elected in October 1816, and

19352-529: The intermittent Gila River —which carries runoff from western New Mexico and most of Arizona–before defining 24 miles (39 km) of the Mexico–United States border . At Morelos Dam , the entire remaining flow of the Colorado is diverted to irrigate the Mexicali Valley , among Mexico's most fertile agricultural lands. Below San Luis Río Colorado , the Colorado passes entirely into Mexico, defining

19516-525: The lakes in which it was deposited makes the Green River Formation a major source of sodium carbonate. In southwest Wyoming the formation contains the world's largest deposits of trona , and in Colorado, the world's largest deposits of nahcolite . Another unusual mineral, currently only known from the Parachute Creek member is the crystalline nickel porphyrin mineral abelsonite . Colorado River The Colorado River ( Spanish : Río Colorado )

19680-719: The land area of the Colorado River Basin, but contributes 92 percent of the runoff. The entire eastern boundary of the Colorado River Basin runs along the North American Continental Divide and is defined largely by the Rocky Mountains and the Rio Grande Basin . The Wind River Range in Wyoming marks the northern extent of the basin, and is separated from the Colorado Rockies by the endorheic Great Divide Basin in southwestern Wyoming. Streams that are nearby

19844-487: The layers to reveal the fossils. This thin zone represents some 4000 years of deposition. The second fossil zone, the 18 inch layer , is an unlaminated layer about 18 in (46 cm) thick that also contains abundant detailed fossils, but is harder to work because it is not composed of fissile laminae. The limestone matrix is so fine-grained that fossils include rare soft parts of complete insects and fallen leaves in spectacular detail. Some 35,000 fossiliferous rocks from

20008-527: The legacy bequeathed to the nation and pledged the faith of the United States to the charitable trust on July 1, 1836. The American diplomat Richard Rush was dispatched to England by President Andrew Jackson to collect the bequest. Rush returned in August 1838 with 105 sacks containing 104,960 gold sovereigns . This is approximately $ 500,000 at the time, which is equivalent to $ 14,000,000 in 2023 or equivalent to £12,000,000 in 2023. However, when considering

20172-400: The lost funds with interest and, despite designs on the money for other purposes, convinced his colleagues to preserve it for an institution of science and learning. Finally, on August 10, 1846, President James K. Polk signed the legislation that established the Smithsonian Institution as a trust instrumentality of the United States, to be administered by a Board of Regents and a secretary of

20336-486: The lower 100 miles (160 km) of the river, which has rarely reached the sea since the 1960s. Native Americans have inhabited the Colorado River basin for at least 8,000 years. Starting around 1 CE, large agriculture-based societies were established, but a combination of drought and poor land use practices led to their collapse in the 1300s. Their descendants include tribes such as the Puebloans , while others including

20500-513: The lower Colorado River. However, Spanish attempts to control the crossing led to the 1781 Yuma revolt, in which over 100 soldiers and colonists were killed, and the settlements were abandoned. The Quechan blocked foreigners’ use of the crossing until the arrival of American mountain men and fur trappers in the 1820s. The name Rio Colorado first appears in 1701, on the map "Paso por Tierra a la California" published by missionary Eusebio Kino , who also determined during that time that Baja California

20664-565: The majority of Colorado River runoff. Tributaries between there and Imperial Dam near the US–Mexico border contribute a further 1.1 million acre-feet (1.4 km ), and the Gila– Salt River system historically accounted for another 1.7 million acre-feet (2.1 km ). While much of this water was lost to evaporation in the deserts of the Lower Basin, anywhere from 10 to 20 million acre-feet (12 to 25 km ) per year reached

20828-492: The majority of Green River vertebrate fossils in public and private collections all over the world. The Green River Formation contains the largest oil shale deposit in the world. It has been estimated that the oil shale reserves could equal up to 3 trillion barrels (480 billion cubic metres) of shale oil , up to half of which may be recoverable by shale oil extraction technologies ( pyrolysis , hydrogenation , or thermal dissolution of kerogen in oil shale). However,

20992-489: The massive Hoover and Glen Canyon Dams, inflows to Lake Powell still experience distinct spring highs and winter lows, though overall volumes have been reduced due to Upper Basin water diversions. Flow regimes in a few Upper Basin tributaries, such as the Yampa River , remain almost completely unaltered. By the 1950s, the Colorado delta was regularly drying up in fall and winter, though spring high flows often still made it to

21156-452: The mission to "promote science and the useful arts, and to establish a national museum of natural history," this organization continued to press Congress to establish a museum that would be structured in terms that were very similar to those finally incorporated into the founding of the Smithsonian Institution. Its work helped to develop an underlying philosophy that pushed for the pursuit and development of scientific knowledge that would benefit

21320-547: The most controlled and litigated river systems in the world. Since 2000, extended drought has conflicted with increasing demands for Colorado River water, and the level of human development and control of the river continues to generate controversy. The Colorado begins at La Poudre Pass in the Never Summer Mountains in Rocky Mountain National Park , 10,184 ft (3,104 m) above sea level. After

21484-606: The museums. In 1912, First Lady Helen Herron Taft donated her inauguration gown to the museum to begin the First Ladies' Gown display at the National Museum of American History , one of the Smithsonian's most popular exhibits. The museum displays treasures such as the Star-Spangled Banner , the stove pipe hat that was worn by President Abraham Lincoln , the ruby slippers worn by Judy Garland in The Wizard Of Oz , and

21648-473: The nation, and edify its citizens at the same time. The British scientist James Smithson (1765–1829) left most of his wealth to his nephew Henry James Hungerford. When Hungerford died childless in 1835, the estate passed "to the United States of America, to found at Washington, under the name of the Smithsonian Institution, an Establishment for the increase & diffusion of knowledge among men", in accordance with Smithson's will. Congress officially accepted

21812-679: The north and south, and enabled the expansion of trade to the Pima and Maricopa in the east and coastal California tribes in the west. The Navajo (Diné) began migrating into the Colorado River Basin around 1000-1500 CE, and eventually exercised influence over much of the Colorado Plateau. Originally hunter-gatherers, they acquired knowledge of farming from the Puebloans and adopted a more sedentary lifestyle over time, making extensive use of irrigation in their settlements. The Navajo gradually displaced Hopi settlements as they expanded into northern Arizona after

21976-512: The northernmost part of the gulf in approximately 1 million years. Cut off from the ocean, the portion of the gulf north of the delta eventually evaporated and formed the Salton Sink , which reached about 260 feet (79 m) below sea level. Since then the river has changed course into the Salton Sink at least three times, transforming it into Lake Cahuilla , which at maximum size flooded up

22140-423: The ocean. After the initial closure of Glen Canyon Dam in 1963, these seasonal flows were almost completely eliminated, with the exception of a few very wet years, such as 1983–1987. In 1984, 16.5 million acre-feet (20.4 km ) of excess runoff reached the ocean. Flows have further declined due to evaporation from reservoirs and, particularly after 2000, reduced snowpack with warming winter temperatures in

22304-662: The opening of the Renwick Gallery in 1972 in the 1874 Renwick-designed art gallery originally built by local philanthropist William Wilson Corcoran to house the Corcoran Gallery of Art . The first new museum building to open since the National Museum of History and Technology was the Hirshhorn Museum and Sculpture Garden , which opened in 1974. The National Air and Space Museum , the Smithsonian's largest in terms of floor space, opened in June 1976. Eleven years later,

22468-788: The organization was granted a charter by Congress on April 20, 1818 (this charter expired in 1838). Benjamin Latrobe , who was architect for the US Capitol after the War of 1812, and William Thornton , the architect who designed the Octagon House and Tudor Place , would serve as officers. Other prominent members, who numbered from 30 to 70 during the institute's existence, included John Quincy Adams , Andrew Jackson , Henry Clay , Judge William Cranch , and James Hoban . Honorary members included James Madison , James Monroe , John Adams , Thomas Jefferson , and

22632-443: The original Teddy Bear that was named after President Theodore Roosevelt . In 2016, the Smithsonian's Air & Space museum curators restored the large model Enterprise from the original Star Trek TV series. Following international debates about the decolonisation of museums and the legal and moral justifications of their acquisitions, the Smithsonian adopted a new "ethical returns policy" on April 29, 2022. This will permit

22796-749: The osteoderms of Borealosuchus , the crocodile that was an early clue to the mild Eocene climate of Western North America. Fish are common. The fossils of the herring-like Knightia , sometimes in dense layers, as if a school had wandered into anoxic water levels and were overcome, are familiar to fossil-lovers and are among the most commonly available fossils on the commercial market. There were two genera of indigenous freshwater stingray , Heliobatis and Asterotrygon . Approximately sixty vertebrate taxa in all have been found at Green River. Besides fishes they include at least eleven species of reptiles, and some birds and one armadillo -like mammal, Brachianodon westorum , with some scattered vertebrae of others, like

22960-422: The public in their own communities about how Latinos are enriching America's cultural fabric." The institution publishes Smithsonian magazine monthly and Air & Space magazine bimonthly. Smithsonian was the result of Secretary of the Smithsonian S. Dillon Ripley asking the retired editor of Life magazine Edward K. Thompson to produce a magazine "about things in which the Smithsonian Institution

23124-407: The railroad had reached Grand Junction, and a spur up the Colorado to Glenwood Springs was completed in 1887. In Arizona and Utah Territories , many early settlers were Mormons fleeing religious persecution in the Midwest. Mormons founded agricultural colonies at Fort Santa Clara in 1855 and St. Thomas , now flooded under Lake Mead, in 1865. Stone's Ferry , crossing the Colorado at the mouth of

23288-419: The reading of scientific and literary productions, but this was continued for only a short time, as the number attending declined rapidly. Eighty-five communications by 26 people were made to Congress during the entire life of the society, with more than a half relating to astronomy or mathematics. Among all the activities planned by the institute, only a few were actually implemented. Two were the establishment of

23452-402: The region, they became involved in skirmishes with the Mohave, spurring U.S. Army expeditions that culminated in the 1859 Battle of the Colorado River which concluded the Mohave War . In the 1870s the Mohave were moved to the Fort Mohave and Colorado River reservations. Chemehuevi and later some Hopi and Navajo peoples were also moved to the Colorado River reservation, where they today form

23616-404: The remote Pahreah Crossing in Arizona, where he took over a ferry first established in 1864 by Jacob Hamblin . This, the only river crossing for hundreds of miles not hemmed in by vertical canyon walls, became known as Lee's Ferry . While Lee was tried and subsequently executed in 1877, the ferry remained a major transportation link until the Navajo Bridge was completed nearby in 1928, rendering

23780-454: The river that flow through the Grand Canyon are largely encompassed by Grand Canyon National Park and are known for their difficult whitewater, separated by pools that reach up to 110 feet (34 m) in depth. At the lower end of Grand Canyon, the Colorado widens into Lake Mead , the largest reservoir in the continental United States, formed by Hoover Dam on the border of Arizona and Nevada . Situated southeast of metropolitan Las Vegas ,

23944-401: The river's present course and the Grand Canyon were formed is uncertain. Before the Gulf of California was formed around 12 to 5 million years ago by faulting processes along the boundary of the North American and Pacific plates, the Colorado flowed west to an outlet on the Pacific Ocean—possibly Monterey Bay on the Central California coast, and may have played a role in the formation of

24108-528: The river's suitability as a navigation route, Ives remarked: "Ours has been the first, and will doubtless be the last, party of whites to visit this profitless locality. It seems intended by nature that the Colorado River, along the greater portion of its lonely and majestic way, shall be forever unvisited and undisturbed." The last part of the Colorado River to be surveyed was the Grand Canyon itself. In 1869, John Wesley Powell with nine men set out on an expedition from Green River Station, Wyoming . They were

24272-512: The river, starting in 1852 with the sidewheeler Uncle Sam , whose first voyage from the Gulf to Yuma took fifteen days. Exploration by steamboat soon advanced upriver. In 1857, George A. Johnson in the General Jesup was able to reach Pyramid Canyon , over 300 miles (480 km) north of Fort Yuma. He was followed by Lt. Joseph Christmas Ives who used a specially built shallow-draft steamboat, Explorer , to reach Black Canyon , where Hoover Dam stands today. Having set out to determine

24436-413: The same year Melchior Díaz explored the Colorado River's delta and named it Rio del Tizon ("fire brand river"), after seeing a practice used by the local people for warming themselves. By the late 1500s or early 1600s, the Utes had acquired horses from the Spanish, and their use for hunting, trade and warfare soon became widespread among Utes and Navajo in the Colorado River basin. This conferred them

24600-454: The seventh largest drainage basin in North America. About 238,600 square miles (618,000 km ), or 97 percent of the basin, is in the United States. The basin extends into western Colorado and New Mexico, southwestern Wyoming , eastern and southern Utah, southeastern Nevada and California, and most of Arizona. The areas drained within Baja California and Sonora in Mexico are very small and do not contribute significant runoff. Aside from

24764-448: The slightly drier mid-Eocene. The climate was moist and mild enough to support crocodiles , which do not tolerate frost, and the lakes were surrounded by sycamore ( e.g. Platanus wyomingensis ) forests. As the lake configurations shifted, each Green River location is distinct in character and time. The lake system formed over underlying river deltas and shifted in the flat landscape with slight tectonic movements, receiving sediments from

24928-640: The staff and unfulfilled financial obligations to sponsors existed. The website's quality was poor, and the center did not have a public affairs manager, a programs director, adequate human resources support, or cohesive mission statement. After difficult times in the first few years, the center improved. According to the Smithsonian, the center "support[s] scholarly research, exhibitions, public and educational programs, web-based content and virtual platforms, and collections and archives. [It] also manage[s] leadership and professional development programs for Latino youth, emerging scholars and museum professionals." Today,

25092-440: The tidal bore—locally called El Burro —formed in the estuary about Montague Island in Baja California and propagated upstream. The Colorado is joined by over 25 significant tributaries, of which the Green River is the largest by both length and discharge. The Green River takes drainage from the Wind River Range of west-central Wyoming, from Utah's Uinta Mountains , and from the Rockies of northwestern Colorado. The Gila River

25256-413: The time it went public. This included 192 gifts of at least $ 1 million. Members of the boards of directors of various Smithsonian museums donated $ 372 million. The Smithsonian said that funds raised would go toward completion of the National Museum of African American History and Culture building, and renovations of the National Air and Space Museum , National Museum of American History , and

25420-423: The valley to present-day Indio, California . The lake took about 50 years to evaporate after the Colorado resumed flowing to the Gulf. The present-day Salton Sea can be considered the most recent incarnation of Lake Cahuilla, though on a much smaller scale. Between 1.8 million and 10,000 years ago, massive flows of basalt from the Uinkaret volcanic field in northern Arizona dammed the Colorado River within

25584-577: The various sediments from the then active Absaroka Volcanic field to the north in the vicinity of Yellowstone and the San Juan volcanic field to the southeast provide dateable horizons within the sediments. The trona (hydrated sodium bicarbonate carbonate) beds of Sweetwater County, Wyoming are noted for a variety of rare evaporite minerals. The Green River Formation, is the type locality for eight rare minerals: bradleyite , ewaldite , loughlinite , mckelveyite-(Y) , norsethite , paralabuntsovite-Mg , shortite and wegscheiderite . It also has

25748-509: The waves better, and we shall have little to carry when we make a portage. We are three-quarters of a mile in the depths of the earth, and the great river shrinks into insignificance, as it dashes its angry waves against the walls and cliffs, that rise to the world above; they are but puny ripples, and we but pigmies, running up and down the sands, or lost among the boulders. We have an unknown distance yet to run; an unknown river yet to explore. What falls there are, we know not; what rocks beset

25912-546: The website features a high-tech virtual museum including self-guided virtual tours of past and present exhibits. The Smithsonian Latino Center's Young Ambassadors Program (YAP) is a program within the Latino Center that reaches out to Latino high school students with the goal of encouraging them to become leaders in arts, sciences, and the humanities. Students selected for the program travel to Washington, D.C. for an "enrichment seminar" that lasts approximately five days. Afterwards, students return to their communities to serve in

26076-484: Was a peninsula, not an island as previously believed. In the 1700s and early 1800s many Spanish and American explorers believed in the existence of a Buenaventura River that ran from the Rocky Mountains to the Pacific coast. In 1776, Silvestre Vélez de Escalante attached this name to the upper Green River, and a number of later maps showed this connecting to Lake Timpanogos (now Utah Lake ) and flowing west to California. The Dominguez–Escalante expedition first reached

26240-595: Was appropriated for meteorological research. The institution became a magnet for young scientists from 1857 to 1866, who formed a group called the Megatherium Club . The Smithsonian played a critical role as the US partner institution in early bilateral scientific exchanges with the Academy of Sciences of Cuba . Construction began on the Smithsonian Institution Building ("the Castle") in 1849. Designed by architect James Renwick Jr. , its interiors were completed by general contractor Gilbert Cameron. The building opened in 1855. The Smithsonian's first expansion came with

26404-481: Was established as a trust instrumentality by act of Congress. More than two-thirds of the Smithsonian's workforce of some 6,300 persons are employees of the federal government. The Smithsonian Institution Office of Protection Services oversees security at the Smithsonian facilities and enforces laws and regulations for National Capital Parks together with the United States Park Police . The president's 2011 budget proposed just under $ 800 million in support for

26568-434: Was inhabited for thousands of years by numerous tribes of the Patayan cultures, many of which belong to the Yuman-Cochimi language group . These include the Walapai , Havasupai and Yavapai in the Grand Canyon region; the Mohave , Halchidhoma , Quechan , and Halyikwamai along the Colorado River between Black Canyon and the Mexican border, and the Cocopah around the Colorado River Delta. The Chemehuevi (a branch of

26732-653: Was originally organized as the United States National Museum , but that name ceased to exist administratively in 1967. The Smithsonian Institution has historical holdings of over 157 million items, 21 museums, 21 libraries, 14 education and research centers, a zoo, and historical and architectural landmarks, mostly located in Washington, D.C. Additional facilities are located in Maryland , New York , and Virginia . More than 200 institutions and museums in 47 states , Puerto Rico , and Panama are Smithsonian Affiliates . Institution publications include Smithsonian and Air & Space magazines. Almost all of

26896-446: Was the first to run the rapids of the Grand Canyon. Large-scale settlement of the lower basin began in the mid- to late-1800s, with steamboats sailing from the Gulf of California to landings along the river that linked to wagon roads to the interior. Starting in the 1860s, gold and silver strikes drew prospectors to the upper Colorado River basin. Large-scale river management began in the early 1900s, with major guidelines established in

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