A mountain pass is a navigable route through a mountain range or over a ridge . Since mountain ranges can present formidable barriers to travel, passes have played a key role in trade, war, and both human and animal migration throughout history. At lower elevations it may be called a hill pass . A mountain pass is typically formed between two volcanic peaks or created by erosion from water or wind.
116-756: Rollins Pass , elevation 11,676 ft (3,559 m), is a mountain pass and active archaeological site in the Southern Rocky Mountains of north-central Colorado in the United States. The pass is located on and traverses the Continental Divide of the Americas at the crest of the Front Range southwest of Boulder and is located approximately five miles east and opposite the resort in Winter Park —in
232-607: A family of pioneers, constructed a toll wagon road over the pass in the 1873, providing a route between the Colorado Front Range and Middle Park ; subsequently, Rollins Pass was named after John Q.A. Rollins. John Q.A. Rollins was born on Sunday, June 16, 1816 in Gilmanton, New Hampshire and was the son of a New England minister. Rollins is described as being a strong man and an extensive character, popular with almost everybody whom he did not owe and his one predominating fault
348-432: A topographic map , passes can be identified by contour lines with an hourglass shape, which indicates a low spot between two higher points. In the high mountains, a difference of 2,000 meters (6,600 ft) between the summit and the mountain is defined as a mountain pass. Passes are often found just above the source of a river , constituting a drainage divide . A pass may be very short, consisting of steep slopes to
464-410: A 1.5-mile (2.4 km) spiral or loop where trains crossed over a trestle, made a ~90 degree gradual turn to descend 150 feet (46 m), and passed through Tunnel #33 underneath the trestle. A rail station, Corona, was established at the summit of the pass, with a red brick and green roofed dining hall, weather station, power station , and lodging. In summers, the train ride from Denver to Corona
580-476: A density 0.5539 times that of air (0.678 kg per standard cubic meter). In the early 1800s, natural gas became known as "natural" to distinguish it from the dominant gas fuel at the time, coal gas . Unlike coal gas, which is manufactured by heating coal, natural gas can be extracted from the ground in its native gaseous form. When the use of natural gas overtook the use of coal gas in English speaking countries in
696-607: A documented history as a migratory route, hunting trail, and battlefield among the late prehistoric and contact-period Indians of Colorado. The Indians, both Ute and Arapahoe, used Rollins Pass. While it is possible to ride a horse across the Range at almost any point except some of the higher and rougher peaks, the Indians were as much interested as the white man in seeking a good grade. Instead of wagons they used teepee poles as drag-poles for transportation of supplies and papooses , and it
812-538: A hotel, "at the point of intersection of the Berthoud and Rollins roads." The road began to fall out of use and into disrepair in 1880, approximately one year before early railroading attempts over the pass begun. Guinn Mountain, encircling Yankee Doodle Lake, was used for mining from the early 1870s through the establishment of the railroad in 1904. This area held at least "four silver lodes" or "five patented lode claims, one patented placer claim, several prospect pits and
928-421: A major source of natural gas in the United States and Canada. Because of increased shale gas production the United States was in 2014 the number one natural gas producer in the world. The production of shale gas in the United States has been described as a "shale gas revolution" and as "one of the landmark events in the 21st century." Following the increased production in the United States, shale gas exploration
1044-482: A non-vital and seasonal recreational road. Each summer, from 1956–1979, Rollins Pass served as a complete road over the mountain pass for automobiles until a substantial rock fall in Needle's Eye Tunnel in 1979 closed the path over the pass. In 1989, after several engineering studies and structural strengthening of Needle's Eye Tunnel were accomplished, the complete road was re-opened only to close permanently in 1990, due to
1160-570: A powder charge exploded prematurely during the construction of Needle's Eye Tunnel . Along this route were three tunnels: Tunnel #31 ( the tunnel at Ladora ), Tunnel #32 ( Needle's Eye Tunnel ), and Tunnel #33 ( the Loop Tunnel at Riflesight Notch ). All three tunnels today are either completely caved in or have had multiple partial cave-ins. Other notable landmarks on the route included the Riflesight Notch Loop, located at Spruce Mountain:
1276-560: A rockfall injuring a sightseer. For the past 34 years—since July 1990—no motorized route connects across the Continental Divide, effectively making each side a dead-end uphill route that must be traveled again, downhill, to leave the pass. In 1969, a natural gas pipeline was placed on Rollins Pass. In the mid-1990s, Rollins Pass was closed for the installation of a 10-inch (250 mm) diameter Xcel Energy high-pressure natural gas pipeline. The pipeline, not always under marker, still
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#17328558469971392-538: A summit and the valley floor. Passes traditionally were places for trade routes, communications, cultural exchange, military expeditions etc. A typical example is the Brenner pass in the Alps . Some mountain passes above the tree line have problems with snow drift in the winter. This might be alleviated by building the road a few meters above the ground, which will make snow blow off the road. There are many words for pass in
1508-538: A synthetic crude that can be further refined into finished products, while MTG can produce synthetic gasoline from natural gas. STG+ can produce drop-in gasoline, diesel, jet fuel and aromatic chemicals directly from natural gas via a single-loop process. In 2011, Royal Dutch Shell's 140,000 barrels (22,000 m ) per day F–T plant went into operation in Qatar . Natural gas can be "associated" (found in oil fields ), or "non-associated" (isolated in natural gas fields ), and
1624-457: A time were driven over the pass. The wagon road had one tollgate and the following rate structure: "For each vehicle drawn by two animals, two dollars and fifty cents; for each additional two animals, twenty-five cents; each vehicle drawn by one animal, one dollar and fifty cents; horse and rider and pack animals , twenty-five cents; loose stock, five cents per head ... horse with rider, or pack animal with pack, ten cents." The cost for nonpayment of
1740-640: A toll was the same as causing intentional damage to the road: $ 25. According to the manuscript of Martin Parsons, "Twistin Dogies Tails Over Rollins Pass ", each summer, Mr. Rollins would "build a cribbing of logs ... and would fill the center with rocks and earth, which helped reduce the grade between the hills." The original log cribbing can be seen today on the narrow ridge of Guinn Mountain, north of Yankee Doodle Lake. Rollins also built The Junction House , "a large, two-story hewd-log structure" as
1856-493: Is a flammable gaseous fuel made by the destructive distillation of coal . It contains a variety of calorific gases including hydrogen , carbon monoxide , methane , and other volatile hydrocarbons , together with small quantities of non-calorific gases such as carbon dioxide and nitrogen , and was used in a similar way to natural gas. This is a historical technology and is not usually economically competitive with other sources of fuel gas today. Most town "gashouses" located in
1972-416: Is a multi-component rock walled game drive and is but one part of a much larger game drive complex located on Rollins Pass. Byron Olson and James Benedict conducted work at the site in the late-1960s. Present-day archaeology teams built on Olson and Benedict's work to expand the overview of the site using modern techniques. As of 2013, at least 45 blinds as well as 1,307 meters of rock walls are present across
2088-421: Is a naturally occurring mixture of gaseous hydrocarbons consisting primarily of methane (95%) in addition to various smaller amounts of other higher alkanes . Traces of carbon dioxide , nitrogen , hydrogen sulfide , and helium are also usually present. Methane is colorless and odorless, and the second largest greenhouse gas contributor to global climate change after carbon dioxide. Because natural gas
2204-458: Is a schematic block flow diagram of a typical natural gas processing plant. It shows the various unit processes used to convert raw natural gas into sales gas pipelined to the end user markets. The block flow diagram also shows how processing of the raw natural gas yields byproduct sulfur, byproduct ethane, and natural gas liquids (NGL) propane, butanes and natural gasoline (denoted as pentanes +). As of mid-2020, natural gas production in
2320-399: Is also found in coal beds (as coalbed methane ). It sometimes contains a significant amount of ethane , propane , butane , and pentane —heavier hydrocarbons removed for commercial use prior to the methane being sold as a consumer fuel or chemical plant feedstock. Non-hydrocarbons such as carbon dioxide , nitrogen , helium (rarely), and hydrogen sulfide must also be removed before
2436-616: Is beginning in countries such as Poland, China, and South Africa. Chinese geologists have identified the Sichuan Basin as a promising target for shale gas drilling, because of the similarity of shales to those that have proven productive in the United States. Production from the Wei-201 well is between 10,000 and 20,000 m per day. In late 2020, China National Petroleum Corporation claimed daily production of 20 million cubic meters of gas from its Changning-Weiyuan demonstration zone. Town gas
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#17328558469972552-399: Is credited as the first woman to cross the pass. That day held many challenges, including a two-hour blizzard, "which was of terrific violence" and she remarked in a newspaper article, "the bumping was so hard I thought I was nearly dead." As there was no formal road constructed from "Yankee Doodle Camp on up, only an Indian trail, she and the children had been left behind while her husband took
2668-412: Is dead. Trees affected by the beetles contain 10 times less water than a healthy tree and crown fires can quickly spread. Mountain pass Mountain passes make use of a gap , saddle , col or notch . A topographic saddle is analogous to the mathematical concept of a saddle surface , with a saddle point marking the minimum high point between two valleys and the lowest point along a ridge. On
2784-537: Is estimated to have 51,000 cubic kilometers (12,000 cu mi) of natural gas and 50 billion barrels (7.9 billion cubic meters) of natural gas condensates . Because natural gas is not a pure product, as the reservoir pressure drops when non-associated gas is extracted from a field under supercritical (pressure/temperature) conditions, the higher molecular weight components may partially condense upon isothermic depressurizing—an effect called retrograde condensation . The liquid thus formed may get trapped as
2900-502: Is frequently the only flat ground in the area, and may be a high vantage point. In some cases this makes it a preferred site for buildings. If a national border follows the ridge of a mountain range, a pass over the mountains is typically on the border, and there may be a border control or customs station, and possibly a military post. For instance, Argentina and Chile share the world's third-longest international border , 5,300 kilometres (3,300 mi) long, which runs north–south along
3016-694: Is heated and compressed deep underground. Methanogenic organisms produce methane from a variety of sources, principally carbon dioxide. During petroleum production, natural gas is sometimes flared rather than being collected and used. Before natural gas can be burned as a fuel or used in manufacturing processes, it almost always has to be processed to remove impurities such as water. The byproducts of this processing include ethane , propane , butanes , pentanes , and higher molecular weight hydrocarbons. Hydrogen sulfide (which may be converted into pure sulfur ), carbon dioxide , water vapor , and sometimes helium and nitrogen must also be removed. Natural gas
3132-561: Is in existence and uses the low pass to reach the Front Range by loosely following County Road 8 in Fraser , utilizing much of Ranch Creek towards the Middle Fork of Ranch Creek below Mount Epworth, climbing the pass near Ptarmigan Point, and following much of the old railbed past Corona at the summit of Rollins Pass. The pipeline continues across the railbed towards and under the twin trestles, down
3248-403: Is natural gas produced from shale . Because shale's matrix permeability is too low to allow gas to flow in economical quantities, shale gas wells depend on fractures to allow the gas to flow. Early shale gas wells depended on natural fractures through which gas flowed; almost all shale gas wells today require fractures artificially created by hydraulic fracturing . Since 2000, shale gas has become
3364-408: Is odorless, odorizers such as mercaptan (which smells like rotten eggs ) are commonly added to it for safety so that leaks can be readily detected. Natural gas is a fossil fuel that is formed when layers of organic matter (primarily marine microorganisms) decompose under anaerobic conditions and are subjected to intense heat and pressure underground over millions of years. The energy that
3480-406: Is often stored underground [references about geological storage needed]inside depleted gas reservoirs from previous gas wells, salt domes , or in tanks as liquefied natural gas. The gas is injected in a time of low demand and extracted when demand picks up. Storage nearby end users helps to meet volatile demands, but such storage may not always be practicable. With 15 countries accounting for 84% of
3596-452: Is preparing to export natural gas. Floating liquefied natural gas (FLNG) is an innovative technology designed to enable the development of offshore gas resources that would otherwise remain untapped due to environmental or economic factors which currently make them impractical to develop via a land-based LNG operation. FLNG technology also provides a number of environmental and economic advantages: Many gas and oil companies are considering
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3712-545: Is primarily dependent on proximity to markets (pipelines), and regulatory restrictions. Natural gas can be indirectly exported through the absorption in other physical output. The expansion of shale gas production in the US has caused prices to drop relative to other countries. This has caused a boom in energy intensive manufacturing sector exports, whereby the average dollar unit of US manufacturing exports has almost tripled its energy content between 1996 and 2012. A "master gas system"
3828-429: Is primarily used in the northern hemisphere. North America and Europe are major consumers. Often well head gases require removal of various hydrocarbon molecules contained within the gas. Some of these gases include heptane , pentane , propane and other hydrocarbons with molecular weights above methane ( CH 4 ). The natural gas transmission lines extend to the natural gas processing plant or unit which removes
3944-709: Is sometimes informally referred to simply as "gas", especially when it is being compared to other energy sources, such as oil, coal or renewables. However, it is not to be confused with gasoline , which is also shortened in colloquial usage to "gas", especially in North America. Natural gas is measured in standard cubic meters or standard cubic feet . The density compared to air ranges from 0.58 (16.8 g/mole, 0.71 kg per standard cubic meter) to as high as 0.79 (22.9 g/mole, 0.97 kg per scm), but generally less than 0.64 (18.5 g/mole, 0.78 kg per scm). For comparison, pure methane (16.0425 g/mole) has
4060-541: Is that a pass can refer to a route, as well as the highest part thereof, while a hause is simply that highest part, often flattened somewhat into a high-level plateau. In Japan they are known as tōge , which means "pass" in Japanese. The word can also refer to narrow, winding roads that can be found in and around mountains and geographically similar areas, or specifically to a style of street racing which may take place on these roads. There are thousands of named passes around
4176-604: Is traded on a "dry gas" basis and is required to be commercially free from objectionable odours, materials, and dust or other solid or liquid matter, waxes, gums and gum forming constituents, which might damage or adversely affect operation of equipment downstream of the custody transfer point. LNG carrier ships transport liquefied natural gas (LNG) across oceans, while tank trucks can carry LNG or compressed natural gas (CNG) over shorter distances. Sea transport using CNG carrier ships that are now under development may be competitive with LNG transport in specific conditions. Gas
4292-409: Is transported at high pressure, typically above 200 bars (20,000 kPa; 2,900 psi). Compressors and decompression equipment are less capital intensive and may be economical in smaller unit sizes than liquefaction/regasification plants. Natural gas trucks and carriers may transport natural gas directly to end-users, or to distribution points such as pipelines. In the past, the natural gas which
4408-416: Is turned into liquid at a liquefaction plant, and is returned to gas form at regasification plant at the terminal . Shipborne regasification equipment is also used. LNG is the preferred form for long distance, high volume transportation of natural gas, whereas pipeline is preferred for transport for distances up to 4,000 km (2,500 mi) over land and approximately half that distance offshore. CNG
4524-513: The Andes mountains and includes 42 mountain passes. On a road over a pass, it is customary to have a small roadside sign giving the name of the pass and its elevation above mean sea level . Apart from offering relatively easy travel between valleys, passes also provide a route between two mountain tops with a minimum of descent. As a result, it is common for tracks to meet at a pass; this often makes them convenient routes even when travelling between
4640-504: The Antiquities Act , among other federal and cultural laws, recognizes the nonrenewable and vulnerable nature of cultural resources and these laws protect and make it illegal to collect artifacts, including but not limited to: arrowheads , horseshoes , buttons , cans , glass or ceramic bottles , dishware and utensils , coal , railroad spikes , snowshed wood, railroad ties , and telegraph poles from Rollins Pass. All artifacts—from
4756-658: The Continental Divide Trail ; an airway radial (V8), a 10" Xcel Energy high-pressure natural gas pipeline, and two roads: The Front Range was created by the Laramide Orogeny , the last of three major mountain-building events, which occurred between 70 and 40 million years ago. Tectonic activity during the Cenozoic Era changed the Ancestral Rocky Mountains via block uplift, eventually forming
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4872-737: The Taglang La at 5,328 m (17,480 ft) on the Leh-Manali highway , and the Sia La at 5,589 m (18,337 ft) in the Eastern Karakoram range. Scotland has the Gaelic term bealach (anglicised "balloch"), while Wales has the similar bwlch (both being insular Celtic languages). In the Lake District of north-west England, the term hause is often used, although the term pass is also common—one distinction
4988-515: The historical record . Visitors are encouraged to preserve the area for future generations by leaving items in place and sharing photographs and GPS coordinates (if available) with researchers dedicated to telling the story of Rollins Pass and an internet resource has been set up to aid with this project. County sheriffs as well as United States Forest Service Law Enforcement personnel and staff routinely patrol and enforce natural and cultural resources on Rollins Pass as well as in other areas within
5104-427: The supply chain can result in natural gas having a similar carbon footprint to other fossil fuels overall. Natural gas can be found in underground geological formations , often alongside other fossil fuels like coal and oil (petroleum). Most natural gas has been created through either biogenic or thermogenic processes. Thermogenic gas takes a much longer period of time to form and is created when organic matter
5220-412: The "Rollins road" through Boulder Pass was not completed until the first half of August 1873. While the newspaper articles cited "wagons can now be taken over this route without the slightest trouble," other articles countered, "the trail ... is splendid for horses but fearful for wagons" and "the rocks, mud-holes, bogs, creeks, boulders and sidling ledges of that road, can only be appreciated by being seen,
5336-414: The 19th century and all attempts were met with impassable engineering challenges, financing issues, or both: GHS, Jefferson, & Boulder County Railroad and Wagon Road (A.N. Rogers' line) in 1867; U.P. in 1866; Kansas Pacific in 1869; Colorado Railroad (B. & M. subsidiary) in 1884—two tunnels located; Denver, Utah & Pacific in 1881 (construction started and tunnel located). The remains of
5452-548: The 19th century, natural gas was primarily obtained as a by-product of producing oil . The small, light gas carbon chains came out of solution as the extracted fluids underwent pressure reduction from the reservoir to the surface, similar to uncapping a soft drink bottle where the carbon dioxide effervesces . The gas was often viewed as a by-product, a hazard, and a disposal problem in active oil fields. The large volumes produced could not be used until relatively expensive pipeline and storage facilities were constructed to deliver
5568-406: The 20th century, it was increasingly referred to as simply "gas." In order to highlight its role in exacerbating the climate crisis , however, many organizations have criticized the continued use of the word "natural" in referring to the gas. These advocates prefer the term "fossil gas" or "methane gas" as better conveying to the public its climate threat. A 2020 study of Americans' perceptions of
5684-577: The China–India border respectively, appear to be world's two highest motorable passes. Khunjerab Pass between Pakistan and China at 4,693 metres (15,397 ft) is also a high-altitude motorable mountain pass. One of the famous but non-motorable mountain passes is Thorong La at 5,416 metres (17,769 ft) in Annapurna Conservation Area , Nepal. Natural gas Natural gas (also called fossil gas, methane gas , or simply gas )
5800-720: The English-speaking world. In the United States, pass is very common in the West , the word gap is common in the southern Appalachians , notch in parts of New England , and saddle in northern Idaho . The term col , derived from Old French, is also used, particularly in Europe. In the highest mountain range in the world, the Himalayas, passes are denoted by the suffix "La" in Tibetan, Ladhakhi, and several other regional languages. Examples are
5916-521: The Forest Lakes. Plans to build a longer tunnel at a lower elevation were better planned and financed; the single-track Moffat Tunnel opened just south of Rollins Pass on Sunday, February 26, 1928. The Moffat Tunnel eliminated 10,800 degrees of curvature along the Rollins Pass route; the tunnel resulted in considerable time savings as well as money that was used for snow removal atop Rollins Pass. After
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#17328558469976032-619: The National Forest System. On both sides of Rollins Pass, the road prism contains both prehistoric and historic artifacts buried under the surface. Any improvements to the rough road through regrading, including paving, would first require extensive sectional archaeological excavations by the United States Forest Service . In several places, on or just under the surface, historical artifacts are covered with geotextile stabilization fabrics having characteristics that match
6148-482: The Olson site; the purposes of which were to funnel game upslope to waiting hunters. Both radiocarbon and lichenometric dating suggest occupation by Native Americans spanning the last 3,200 years, with diagnostic tools suggesting even older use of the site, dating back to more than 10,000 years ago. Game drives at other locations on Rollins Pass yield hundreds of additional blinds and miles of rock walls. Rollins Pass has
6264-588: The Rocky Mountains as they exist today. The geologic make-up of Rollins Pass and the surrounding areas were also affected by deformation and erosion during the Cenozoic Era. Many sedimentary rocks from the Paleozoic and Mesozoic eras exist in the basins surrounding the pass. Paleoindians and early Native Americans were the first to utilize Rollins Pass as a natural, low crossing over the Continental Divide for
6380-432: The US had peaked three times, with current levels exceeding both previous peaks. It reached 24.1 trillion cubic feet per year in 1973, followed by a decline, and reached 24.5 trillion cubic feet in 2001. After a brief drop, withdrawals increased nearly every year since 2006 (owing to the shale gas boom ), with 2017 production at 33.4 trillion cubic feet and 2019 production at 40.7 trillion cubic feet. After
6496-427: The US, over one-third of households (>40 million homes) cook with gas. Natural gas dispensed in a residential setting can generate temperatures in excess of 1,100 °C (2,000 °F) making it a powerful domestic cooking and heating fuel. Stanford scientists estimated that gas stoves emit 0.8–1.3% of the gas they use as unburned methane and that total U.S. stove emissions are 28.1 gigagrams of methane. In much of
6612-515: The United States begins with localized use. In the seventeenth century, French missionaries witnessed the American Indians setting fire to natural gas seeps around lake Erie, and scattered observations of these seeps were made by European-descended settlers throughout the eastern seaboard through the 1700s. In 1821, William Hart dug the first commercial natural gas well in the United States at Fredonia, New York , United States, which led in 1858 to
6728-527: The area contained only negligible amounts of any metal. Samples from the Avalon placer claim , located on the South Fork [of] Middle Boulder Creek north of Guinn Mountain, and from the creek bottom were collected and panned; no gold was found." Despite this record, gold claims were nevertheless worked nearby with no published record of success. There were multiple prior efforts to build a railroad over Rollins Pass in
6844-610: The area for more than six months and very cold and snowy weather may occur nearly year-round. It was these heavy snowstorms that led to the financial demise of the Moffat Road and served as the incentive for construction of a permanent railroad tunnel through the Rocky Mountains and into Middle Park. Following scuba dives , no evidence exists that locomotive, rotary, or wreck debris rests at the bottom of Yankee Doodle Lake or Jenny Lake. However, many derailments, wrecks of Mallet locomotives , accidents resulting in injury and/or death, and/or
6960-697: The bottoms of the gashouse ovens was often used for roofing and other waterproofing purposes, and when mixed with sand and gravel was used for paving streets. Huge quantities of natural gas (primarily methane) exist in the form of clathrates under sediment on offshore continental shelves and on land in arctic regions that experience permafrost , such as those in Siberia . Hydrates require a combination of high pressure and low temperature to form. In 2013, Japan Oil, Gas and Metals National Corporation (JOGMEC) announced that they had recovered commercially relevant quantities of natural gas from methane hydrate. The image below
7076-654: The decayed organisms originally obtained from the sun via photosynthesis is stored as chemical energy within the molecules of methane and other hydrocarbons. Natural gas can be burned for heating, cooking, and electricity generation . Consisting mainly of methane, natural gas is rarely used as a chemical feedstock . The extraction and consumption of natural gas is a major industry. When burned for heat or electricity , natural gas emits fewer toxic air pollutants, less carbon dioxide, and almost no particulate matter compared to other fossil and biomass fuels. However, gas venting and unintended fugitive emissions throughout
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#17328558469977192-558: The dump of one caved adit ." This caved adit, once 365 feet (111 m), then lengthened to 850 feet (260 m), is still shown as a mine on United States Geological Survey topographic maps as the Blue Stones Mine . This tunnel exposed a "five-foot vein of ore varying in values from $ 16 to $ 25 per ton." It was concluded that the "Guinn Mountain area has little or no economic potential," despite listings of important mineral strikes in period newspapers. Further, "ten samples collected in
7308-446: The eastern US in the late 19th and early 20th centuries were simple by-product coke ovens that heated bituminous coal in air-tight chambers. The gas driven off from the coal was collected and distributed through networks of pipes to residences and other buildings where it was used for cooking and lighting. (Gas heating did not come into widespread use until the last half of the 20th century.) The coal tar (or asphalt ) that collected in
7424-446: The economic and environmental benefits of floating liquefied natural gas (FLNG). There are currently projects underway to construct five FLNG facilities. Petronas is close to completion on their FLNG-1 at Daewoo Shipbuilding and Marine Engineering and are underway on their FLNG-2 project at Samsung Heavy Industries . Shell Prelude is due to start production 2017. The Browse LNG project will commence FEED in 2019. Natural gas
7540-532: The era of powered flight, Rollins Pass provides an attractive way to cross the Continental Divide between west and east at a relatively low point for aircraft. Not only does the enroute airway radial, Victor Eight , cross the pass; but also a rotating airway beacon was established in the mid-to-late 1940s and first appeared on aeronautical sectional charts in March 1948 as a star, indicating a beacon. The beacon and its supporting infrastructure have since been removed due to
7656-577: The first year of operations, an annual report to stockholders showed "marked savings in operating costs" by 24.86%. Savings were seen in other areas, including in fuel reductions ($ 89,074.45 savings; $ 1.3 million in 2018 when adjusted for inflation), engine servicing ($ 156,188.89 savings); whereas gross tons per train hour increased by 34.84%. After the Moffat Tunnel opened, the tracks over Rollins Pass remained in place and were maintained at least as late as July 1929 as an emergency route. This emergency route
7772-486: The formation of the Fredonia Gas Light Company . Further such ventures followed near wells in other states, until technological innovations allowed the growth of major long distance pipelines from the 1920s onward. By 2009, 66,000 km (16,000 cu mi) (or 8%) had been used out of the total 850,000 km (200,000 cu mi) of estimated remaining recoverable reserves of natural gas. In
7888-461: The fuel found that, across political identifications, the term "methane gas" led to better estimates of its harms and risks. Natural gas can come out of the ground and cause a long-burning fire. In ancient Greece , the gas flames at Mount Chimaera contributed to the legend of the fire-breathing creature Chimera . In ancient China , gas resulting from the drilling for brines was first used by about 400 BC. The Chinese transported gas seeping from
8004-435: The gas needs to be cooled down and compressed, as the friction in the pipeline causes the gas to heat up. Many existing pipelines in the US are close to reaching their capacity, prompting some politicians representing northern states to speak of potential shortages. The large trade cost implies that natural gas markets are globally much less integrated, causing significant price differences across countries. In Western Europe ,
8120-512: The gas pipeline network is already dense. New pipelines are planned or under construction between Western Europe and the Near East or Northern Africa . Whenever gas is bought or sold at custody transfer points, rules and agreements are made regarding the gas quality. These may include the maximum allowable concentration of CO 2 , H 2 S and H 2 O . Usually sales quality gas that has been treated to remove contamination
8236-896: The gas to consumer markets. Until the early part of the 20th century, most natural gas associated with oil was either simply released or burned off at oil fields. Gas venting and production flaring are still practised in modern times, but efforts are ongoing around the world to retire them, and to replace them with other commercially viable and useful alternatives. In addition to transporting gas via pipelines for use in power generation, other end uses for natural gas include export as liquefied natural gas (LNG) or conversion of natural gas into other liquid products via gas to liquids (GTL) technologies. GTL technologies can convert natural gas into liquids products such as gasoline, diesel or jet fuel. A variety of GTL technologies have been developed, including Fischer–Tropsch (F–T), methanol to gasoline (MTG) and syngas to gasoline plus (STG+). F–T produces
8352-746: The general area between Winter Park and Rollinsville . Rollins Pass is at the boundaries of Boulder , Gilpin , and Grand counties. Over the past 10,000 years, the pass provided a route over the Continental Divide between the Atlantic Ocean watershed of South Boulder Creek (in the basin of the South Platte River ) with the Pacific Ocean watershed of the Fraser River , a tributary of the Colorado River . The abandoned rail route over Rollins Pass
8468-518: The ground in crude pipelines of bamboo to where it was used to boil salt water to extract the salt in the Ziliujing District of Sichuan . Natural gas was not widely used before the development of long distance pipelines in the early twentieth century. Before that, most use was near to the source of the well, and the predominant gas for fuel and lighting during the industrial revolution was manufactured coal gas. The history of natural gas in
8584-442: The higher-molecular weight hydrocarbons to produce natural gas with energy content between 35–39 megajoules per cubic metre (950–1,050 British thermal units per cubic foot). The processed natural gas may then be used for residential, commercial and industrial uses. Natural gas flowing in the distribution lines is called mid-stream natural gas and is often used to power engines which rotate compressors. These compressors are required in
8700-668: The introduction of the Low-Frequency Radio Range systems to replace visual navigational aids . The rough road that was once used to service and reach Beacon Peak at the Continental Divide, branches off of the Rollins Pass road, and is closed to all forms of motorized traffic per the current Motor Vehicle Use Maps. Plans to convert Rollins Pass into an historic automobile road were first published in November 1949. Several years later, on Saturday, September 1, 1956, Colorado lieutenant governor , Steve McNichols , opened Rollins Pass as
8816-594: The largest proven gas reserves. Sources that consider that Russia has by far the largest proven reserves include the US Central Intelligence Agency (47,600 km ) and Energy Information Administration (47,800 km ), as well as the Organization of Petroleum Exporting Countries (48,700 km ). Contrarily, BP credits Russia with only 32,900 km , which would place it in second, slightly behind Iran (33,100 to 33,800 km , depending on
8932-417: The latter tunneling attempt can still be seen on the northern slope of the rock wall at Yankee Doodle Lake and the detritus from the attempted excavation of the tunnel was placed at the northernmost part of the lake where pulverized granite tailings can be seen rising out of the water. These tailings were definitively from the 1880s tunneling efforts as they are not visible in the early stereoscopic images from
9048-433: The loss of portions of rail manifests occurred on both sides of the pass: Despite the challenges documented above, by 1918, it was reported that 45 or 46 engines were part of the motive power of the railroad along with 3 rotary snowplows. Several locations for the Moffat Tunnel were scouted prior to the selection of the present-day location; one possible location was identified at high altitude between Yankee Doodle Lake and
9164-702: The modern route. The route through the Moffat Tunnel became part of the mainline across Colorado for the Denver and Salt Lake Railroad , later the Denver and Rio Grande Railroad , and now the Union Pacific Railroad . The Moffat Tunnel continues to be used for both the Amtrak 's California Zephyr that provides service between Chicago, Illinois and Emeryville, California as well as for the winter and sometimes summer Ski Train that operated between Denver and Winter Park from 1940 to 2009; in March 2015 and from 2017–present,
9280-494: The names of their apex stations. Fremont Pass , for example, is not named Climax Pass ; nor is La Veta Pass referred to as Fir Pass . The elevation of '11,660 feet' commonly attributed to Rollins Pass (note the McClure sketch later in this article) "reflects what might have been an original survey value obtained during either the late wagon road era or early railroad construction. ... The actual benchmarked survey elevation value of
9396-578: The native environment of Rollins Pass, leave no trace and trail ethics apply to all visitors. Trundling is discouraged for safety and environmental concerns as well as to preserve artifacts. Rollins Pass consists of several distinct floral environments including lodgepole pine and quaking aspen at lower elevations, and krummholz at tree line. Above tree line, the landscape consists largely of small perennial wildflowers , cryptobiotic soils , and alpine tundra . The latter being extremely fragile and if damaged, can take 100–500 years to recover. Leaving
9512-433: The natural gas can be transported. Natural gas extracted from oil wells is called casinghead gas (whether or not truly produced up the annulus and through a casinghead outlet) or associated gas. The natural gas industry is extracting an increasing quantity of gas from challenging, unconventional resource types : sour gas , tight gas , shale gas , and coalbed methane . There is some disagreement on which country has
9628-440: The old wagon route on the spine of Guinn Mountain, and then towards Eldora . The pipeline undergoes internal inspections "at least" every seven years with the deployment of a smart pig inside the pipeline. A majority of Rollins Pass is located within the boundaries of two national forests— Roosevelt National Forest and Arapaho National Forest —and as such, is federal land. The Archaeological Resources Protection Act along with
9744-453: The only wonder is that a wagon can be taken over at all." Other articles were a bit more grim, referring to the wagon road as a "little more than the rocky ridge of a precipice along which lurked death and disaster." Newspaper records reflect on Friday, June 12, 1874, James Harvey Crawford along with his wife, Margaret Emerine Bourn Crawford, made pioneer history as the first (nonindigenous) couple to cross Rollins Pass by wagons, and Mrs. Crawford
9860-441: The pores of the gas reservoir get depleted. One method to deal with this problem is to re-inject dried gas free of condensate to maintain the underground pressure and to allow re-evaporation and extraction of condensates. More frequently, the liquid condenses at the surface, and one of the tasks of the gas plant is to collect this condensate. The resulting liquid is called natural gas liquid (NGL) and has commercial value. Shale gas
9976-475: The prehistoric to the historic—on the pass are objects of antiquity and are being studied and documented by universities and government agencies. The material record of Rollins Pass is illegally carried away each year—some by poachers—others in the backpacks of well-intentioned visitors who want a souvenir ; but once artifacts are removed, a place can never again reveal the mysteries of the past. Each artifact has important scientific and cultural value and theft harms
10092-514: The purposes of communal hunting of large game, including bighorn sheep and elk . There are more than 96 documented game drives , including the Olson game drive, found largely above timberline and near the summits of multiple mountain ridges. Handmade rock walls drove prey toward hunters waiting in blinds. These unique high-altitude constructs were built, refined, and continually used over millennia. The game drives built on—and over—Rollins Pass have international significance. The Olson site (5BL147)
10208-493: The rails were removed the following summer: the west side was cleared by Tuesday, August 11, 1936, and the east side 14 days later; contractors toiled non-stop, including overnight to remove both the rails and ties. A wye on the passing siding at the East Portal of the Moffat Tunnel is currently utilized for short-turning some modern services and marks the spot where the Rollins Pass line, if it still existed, would have merged into
10324-549: The service was rebranded the Winter Park Express . The original 1922 law that authorized the construction of the Moffat Tunnel specified that it should also be used for automobile traffic, with automobiles being placed on a ferry of flatbed railcars. To date, this has not happened. The pioneer bore used to originally construct the Moffat Tunnel was later converted into the Moffat Water Tunnel by Denver Water . In
10440-443: The soil and permeability of the existing roadbed. There are several drystack retaining walls on both sides of the pass, built without mortar, helping ensure they retain soil but not water. There are several ghost towns on or near Rollins Pass, the most notable being Arrow, Corona, Ladora, the East Portal construction camp, Mammoth, and Tolland. There are also at least a half-dozen other established settlements, dating back to both
10556-543: The source). It is estimated that there are about 900,000 km of "unconventional" gas such as shale gas, of which 180,000 km may be recoverable. In turn, many studies from MIT , Black & Veatch and the US Department of Energy predict that natural gas will account for a larger portion of electricity generation and heat in the future. The world's largest gas field is the offshore South Pars / North Dome Gas-Condensate field , shared between Iran and Qatar. It
10672-570: The summit of Rollins Pass is 11,671 feet ( NGVD29 ), obtained during a 1952 second-order level line run from State Bridge to Denver by the United States Coast and Geodetic Survey (predecessor to the National Geodetic Survey ). When adjusted to NAVD88 , the elevation is, without doubt, 11,676.79 feet." Rollins Pass has been in continuous use for millennia: first as a sprawling and internationally significant game drive complex that
10788-640: The third peak in December 2019, extraction continued to fall from March onward due to decreased demand caused by the COVID-19 pandemic in the US . The 2021 global energy crisis was driven by a global surge in demand as the world quit the economic recession caused by COVID-19, particularly due to strong energy demand in Asia. Because of its low density, it is not easy to store natural gas or to transport it by vehicle. Natural gas pipelines are impractical across oceans, since
10904-513: The top of the pass, or a valley many kilometers long, whose highest point might only be identifiable by surveying . Roads and railways have long been built through passes. Some high and rugged passes may have tunnels bored underneath a nearby mountainside, as with the Eisenhower Tunnel bypassing Loveland Pass in the Rockies, to allow faster traffic flow throughout the year. The top of a pass
11020-646: The trail can cause erosion , land degradation , possible species extinction , and habitat destruction and it is for these reasons vehicles, including off-road vehicles , are not allowed to leave the established road. There are at least two marked revegetation areas on Rollins Pass: one at Yankee Doodle Lake; the other at the summit leading to the historic dining hall foundation. The mountain pine beetle epidemic, beginning in 1996 and continuing through present day, affects many forested areas in Colorado, including those on Rollins Pass. One out of every 14 trees in Colorado
11136-412: The transmission line to pressurize and repressurize the mid-stream natural gas as the gas travels. Typically, natural gas powered engines require 35–39 MJ/m (950–1,050 BTU/cu ft) natural gas to operate at the rotational name plate specifications. Several methods are used to remove these higher molecular weighted gases for use by the natural gas engine. A few technologies are as follows: In
11252-411: The wagon pulled by a pair of mules, a team of horses and a yoke of oxen on up and camped. Then he came back for her with the team and the running gear only of the wagon, and she had to hold the children on someway, despite the dreadful bumping" with the "wagon almost standing on end." The pass was used heavily in the latter half of the 19th century by settlers and at one time as many as 12,000 cattle at
11368-549: The wagon road and railroad eras, scattered across Rollins Pass. There are also several historic gravesites across Rollins Pass. One granite headstone at Arrow reads, "R.M. Smith | June 28, 1842 | Nov. 12, 1909." One marker near the Eldora Ski Area states that it holds two members of John C. Frémont 's third expedition in 1845–1846, although this is disputed. Rollins Pass has unique floral, faunal, and riparian zones that spread across multiple Colorado counties; to best preserve
11484-495: The wagon road era of Yankee Doodle Lake; further, the attempted tunnel was not part of the later rail line that ultimately summited Rollins Pass. In the early 20th century, David Moffat , a Denver banker, established the Denver, Northwestern and Pacific Railway with the intention of building a railroad from Denver toward Salt Lake City, Utah by way of a tunnel under the Continental Divide. Surveys began in April 1902 and construction
11600-405: The wood planking of the sheds. Delays affected the timeliness of both newspaper and postal mail deliveries. Coal smoke and toxic gasses collected in the snowsheds causing temporary blindness, loss of consciousness, and sometimes death. Workers on the Moffat Road had an adage: "There's winter and then there's August", reflecting the fact that in the high mountains of Colorado, snow will often cover
11716-908: The world, some of which are well-known, such as the Khyber Pass close to the present-day Afghanistan-Pakistan border on the ancient Silk Road , the Great St. Bernard Pass at 2,473 metres (8,114 ft) in the Alps , the Chang La at 5,360 metres (17,590 ft), the Khardung La at 5,359 metres (17,582 ft) in Ladakh , India and the Palakkad Gap at 140 metres (460 ft) in Palakkad , Kerala , India . The roads at Mana Pass at 5,610 metres (18,410 ft) and Marsimik La at 5,582 metres (18,314 ft), on and near
11832-498: The worldwide extraction, access to natural gas has become an important issue in international politics, and countries vie for control of pipelines. In the first decade of the 21st century, Gazprom , the state-owned energy company in Russia, engaged in disputes with Ukraine and Belarus over the price of natural gas, which have created concerns that gas deliveries to parts of Europe could be cut off for political reasons. The United States
11948-574: Was added to the National Register of Historic Places in 1976, and lay dormant for many decades after it was shuttered in 1947; in 2015, it was made the focal point of a senior living community center, after it was meticulously restored. Despite the fact that the line was enclosed in almost continuous snowsheds (wooden tunnels) near the summit of the pass, trains were often stranded for several days (and in some cases up to 30–60 days) during heavy snowstorms because snow could fall or be blown through
12064-520: Was advertised as a trip, "from sultry heat to Colorado's north pole;" tourists could stand in snowdrifts in the middle of July or August. Tours launched from the Moffat Depot, a small building constructed in the Georgian Revival style, featuring two-story tall windows, intricate exterior brickwork, and roofline pommels. This building, located several city blocks northwest from Denver Union Station ,
12180-438: Was also known infrequently as Rollinsville Pass. In Grand County, Rollins Pass is sometimes given the sobriquet of Corona Pass , named for the apex station at the summit, Corona. This nomenclature dispute provoked the ire of former railroaders; in fact, Frederick Bauer remarked, "[Rollins Pass is] incorrectly called Corona Pass by neophytes and some locals." It is inconsistent, as well as atypical, to refer to mountain passes by
12296-436: Was always intended to be temporary until what would later become the Moffat Tunnel was constructed and opened; therefore this overmountain route was constructed with more cost-effective materials: using wooden trestles (made of all Oregon fir) instead of iron bridges or high fills and wyes instead of turntables . Construction of this route was exceptionally dangerous and deadly: in a single day, 60 Swedish workers were killed when
12412-463: Was better known nor counted more warm friends than John Q.A. Rollins." John Rollins capitalized on this and received approval for his toll wagon road on Tuesday, February 6, 1866. The Council and House of Representatives of Colorado Territory passed an act signed by the governor approving the wagon road as the "Middle Park and South Boulder Wagon Road Company." Records reflect the incorporators as "John Q.A. Rollins, Perley Dodge, Frederic C. Weir." Yet,
12528-486: Was hand-constructed and used by Paleoindians more than 10,000 years ago through the mid-19th century; followed by nearly two decades as a wagon road from 1862–1880; as a rail route (under survey , construction, and later operational) from 1880 to 1928; as a primitive automobile road from 1936 to 1956; and since September 1, 1956 as a seasonal, unpaved motor vehicle road. The pass is traversed by Paleoindians and Native American game drive complexes, hiking trails, including
12644-565: Was his failure to pay his debts. Newspapers cited that he was so careless about his credit that he could not keep track of all his creditors, and in turn, they had trouble keeping track of him. Rollins died on Wednesday, June 20, 1894 and is buried in Colorado's oldest operating cemetery, Riverside , in block 5, lot 12. His simple tombstone reads, "John Q.A. Rollins | Colorado Pioneer of Rollinsville and Rollins Pass." Colonel Rollins' newspaper obituary mentions, "No man in Northern Colorado
12760-488: Was invented in Saudi Arabia in the late 1970s, ending any necessity for flaring. Satellite and nearby infra-red camera observations, however, shows that flaring and venting are still happening in some countries. Natural gas is used to generate electricity and heat for desalination . Similarly, some landfills that also discharge methane gases have been set up to capture the methane and generate electricity. Natural gas
12876-588: Was listed as one of the most endangered sites in Colorado. Rollins Pass is the sole, official name recognized by both the United States Geological Survey and the United States Board on Geographic Names (BGN) ; a decision card was issued on Wednesday, December 7, 1904. The pass was first known as Boulder Pass —one of two variant names accepted by the BGN—the other being Rogers Pass . The pass
12992-405: Was necessary that they follow easy grades and broad level country, wherever practical. The first recorded use of the pass (then known as Boulder Pass or Rollinsville Pass ) by a wagon train was in 1862, nearly 14 years before Colorado became a state. Directions for wagons traveling from Rollinsville to Winter Park were published in newspapers. John Quincy Adams Rollins, a Colorado pioneer from
13108-500: Was needed only once for a several day-long closure: on Thursday, July 25, 1929, dry rot of wooden timbers caused a collapse and 75 feet (23 m) of rock caved-in and blocked the Moffat Tunnel near the East Portal. It took until Tuesday, July 30, 1929 for the tunnel to be cleared of debris. Permission to dismantle the rails on Rollins Pass was granted by the Interstate Commerce Commission on Saturday, May 18, 1935 and
13224-477: Was nominated for and accepted into the National Register of Historic Places in 1980 because of significant events and engineering feats accomplished by railroading efforts in the early 20th century. In 1997, additional areas on the pass were added to the National Register of Historic Places to include achievements made by John Q.A. Rollins and his toll wagon road that traversed the pass. In 2012, Rollins Pass
13340-567: Was recovered in the course of recovering petroleum could not be profitably sold, and was simply burned at the oil field in a process known as flaring . Flaring is now illegal in many countries. Additionally, higher demand in the last 20–30 years has made production of gas associated with oil economically viable. As a further option, the gas is now sometimes re- injected into the formation for enhanced oil recovery by pressure maintenance as well as miscible or immiscible flooding. Conservation, re-injection, or flaring of natural gas associated with oil
13456-623: Was started in January 1903, beginning on the east side of Rollins Pass. However, the railway only reached Craig, Colorado . This entire line from Denver to Craig was known as the Moffat Road . The line included a 23-mile (37 km) stretch over the top of the Continental Divide, at Rollins Pass, with a two to four percent grade and switchbacks along many sections; the result was one of the highest adhesion (non-cog) standard-gauge railroads ever constructed in North America. This corridor over Rollins Pass
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