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66-724: The Coast Mountains are approximately 1,600 kilometres (1,000 mi) long and average 300 kilometres (190 mi) in width. The range's southern and southeastern boundaries are surrounded by the Fraser River and the Interior Plateau while its far northwestern edge is delimited by the Kelsall and Tatshenshini Rivers at the north end of the Alaska Panhandle, beyond which are the Saint Elias Mountains, and by Champagne Pass in

132-674: A large mass of igneous rock , creating a new continental margin. This large mass of igneous rock is the largest granite outcropping in North America. The final event began when the Farallon Plate continued to subduct under the new continental margin after the Insular Plate and Insular Islands collided with the old continental margin, supporting a new continental volcanic arc called the Coast Range Arc about 100 million years ago during

198-689: A large ski resort at the resort town of Whistler , most of the land in the range is completely undeveloped. Mount Waddington , the highest mountain of the Coast Mountains, lies in the Waddington Range of the Pacific Ranges. Just north of the Pacific Ranges lies the central subdivision known as the Kitimat Ranges. This subdivision extends from the Bella Coola River and Burke Channel in

264-664: A navigable stream". His trip down the river convinced him that Fort Langley could not replace Fort Vancouver as the company's main depot on the Pacific coast. Much of British Columbia's history has been bound to the Fraser, partly because it was the essential route between the Interior and the Lower Coast after the loss of the lands south of the 49th Parallel with the Oregon Treaty of 1846. It

330-523: A pre-existing continental margin and coastline of North America. These volcanic islands, known as the Insular Islands by geoscientists, were formed on a pre-existing tectonic plate called the Insular Plate by subduction of the former Farallon Plate to the west during the early Paleozoic era. This subduction zone records another subduction zone to the east under an ancient ocean basin between

396-650: A regional position within the Canadian Heraldic Authority is named after the river. The Fraser River is known for the fishing of white sturgeon , all five species of Pacific salmon ( chinook , coho , chum , pink , sockeye ), as well as steelhead trout . The Fraser River is also the largest producer of salmon in Canada. A typical white sturgeon catch can average about 500 pounds (230 kg). A white sturgeon weighing an estimated 500 kilograms (1,100 lb) and measuring 3.76 metres (12 ft 4 in)

462-689: A short dam lifespan, but mostly because of strong opposition from fisheries and other environmental concerns. In 1858, the Fraser River and surrounding areas were occupied when the gold rush came to the Fraser Canyon and the Fraser River. It is also a popular fishing location for residents of the Lower Mainland. The delta of the river, especially in the Boundary Bay area, is an important stopover location for migrating shorebirds . The Fraser Herald ,

528-442: A significant spring freshet , primarily impacting regions around Prince George , Kamloops , Hope and Surrey . Due to record snowpacks on the mountains in the Fraser River catch basin which began melting, combined with heavy rainfall, water levels on the Fraser River rose in 2007 to a level not reached since 1972. Low-lying land in areas upriver such as Prince George suffered minor flooding. Evacuation alerts were given for

594-686: Is joined by the Bridge and Seton Rivers at the town of Lillooet , then by the Thompson River at Lytton , where it proceeds south until it is approximately 64 kilometres (40 mi) north of the 49th parallel , which is Canada's border with the United States . From Lytton southwards it runs through a progressively deeper canyon between the Lillooet Ranges of the Coast Mountains on its west and

660-459: Is named Queensborough and is part of the City of New Westminster. Also in the lowermost Fraser, among other smaller islands, is Annacis Island , an important industrial and port area, which lies to the southeast of the eastern end of Lulu Island. Other notable islands in the lower Fraser are Barnston Island , Matsqui Island , Nicomen Island and Sea Bird Island . Other islands lie on the outer side of

726-595: Is part of the Fraser Lowland and was formed also by sediment deposited from the Fraser, though most of the county is not in the Fraser drainage basin. Similar to the Columbia River Gorge east of Portland, Oregon , the Fraser exploits a topographic cleft between two mountain ranges separating a more continental climate (in this case, that of the British Columbia Interior ) from a milder climate near

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792-589: Is suggested that these people were hunters, subsisting also from fishing and plant gathering. The presence of sea shells gives an indication that trading took place. A small, oval-shaped dwelling was also found at the Paulina Lake site in Oregon , dating to 7100 BC . The Cascade phase took place from 7100 to 4300 BC, and was marked by a slight change in toolkit technology from the Windust peoples. A residential structure

858-456: The Boundary Ranges . The Pacific Ranges are the southernmost subdivision of the Coast Mountains, extending from the lower stretches of the Fraser River to Bella Coola . Included in this subdivision is four of the five major coastal icecaps in the southern Coast Mountains. These are the largest temperate-latitude icecaps in the world and fuel a number of major rivers . Other than logging and

924-464: The Cascade Range on its east. Hell's Gate , located immediately downstream of the town of Boston Bar , is a famous portion of the canyon where the walls narrow dramatically, forcing the entire volume of the river through a gap only 35 metres (115 feet) wide. An aerial tramway takes visitors out over the river. Hells Gate is visible from Trans-Canada Highway 1 about 2 km (1.2 mi) south of

990-796: The Fraser River . The Nechako Plateau flanks the Fraser on both sides; its southern boundary is defined by the West Road River (aka the Blackwater River) and the Quesnel River , and its northern boundary consists of the Omineca Mountains and the Cassiar Mountains , which are two major subdivisions of the Interior Mountains . Several mountain ranges and hill-systems are included in

1056-557: The Hudson's Bay Company 's main Pacific depot. Simpson had believed the Fraser River might be navigable throughout its length, even though Simon Fraser had described it as non-navigable. Simpson journeyed down the river and through the Fraser Canyon and afterwards wrote "I should consider the passage down, to be certain Death, in nine attempts out of Ten. I shall therefore no longer talk about it as

1122-684: The Interior of British Columbia , and lies between the Cariboo and Monashee Mountains on the east, and the Hazelton Mountains , Coast Mountains and Cascade Range on the west. The continuation of the plateau into the United States is known there as the Columbia Plateau . Physiographically, the Interior Plateau is a section of the larger Northern Plateaus province, which in turn is part of

1188-724: The Intermontane Plateaus physiographic division. (The Interior Plateau is not part of the Interior Mountains , a huge area that constitutes most of the northern two thirds of the Canadian province of British Columbia between the Coast Mountains, Rocky Mountains and the various small ranges on the inland lea of the Coast Mountains between the Bulkley Ranges and the Bella Coola River ). It has several subdivisions, these being: The Cariboo and Chilcotin Plateaus are separated by

1254-594: The Late Cretaceous period. Magma rising from the Farallon Plate under the new continental margin ascended through the newly accreted Insular Belt, injecting huge quantities of granite into older igneous rocks of the Insular Belt. At the surface, new volcanoes were built along the continental margin. Named after the Coast Mountains, the basement of this arc was likely Early Cretaceous and Late Jurassic intrusions from

1320-579: The Lower Mainland ( Fraser Valley and Metro Vancouver ) occurred in 1894. With no protection against the rising waters of the Fraser River, Fraser Valley and Metro Vancouver communities from Chilliwack downstream were inundated with water. In the 1894 floods, the water mark at Mission reached 7.85 metres (25.75 ft). After the 1894 flood, a dyking system was constructed throughout the Fraser Valley. The dyking and drainage projects greatly improved

1386-526: The Mount Robson Provincial Park , to Steveston in Vancouver at the river mouth. With an average flow at the mouth of about 3,475 cubic metres per second (122,700 cu ft/s), the Fraser is the largest river by discharge flowing into the Pacific seaboard of Canada and the fifth largest in the country. The average flow is highly seasonal; summer discharge rates can be ten times larger than

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1452-659: The North West Company from the site of present-day Prince George almost to the mouth of the river. The river's name in the Halqemeylem (Upriver Halkomelem) language is Sto:lo , often seen archaically as Staulo , and has been adopted by the Halkomelem-speaking peoples of the Lower Mainland as their collective name, Sto:lo . The river's name in the Dakelh language is Lhtakoh . The Tsilhqot'in name for

1518-639: The Pacific Ocean —and contain some of British Columbia's highest mountains. Mount Waddington is the highest mountain of the Coast Mountains and the highest that lies entirely within British Columbia, located northeast of the head of Knight Inlet with an elevation of 4,019 metres (13,186 ft). The Coast Mountains consists of three subdivisions known as the Pacific Ranges , the Kitimat Ranges , and

1584-720: The Rocky Mountain Trench and the Robson Valley near Valemount . After running northwest past 54° north, it makes a sharp turn to the south at Giscome Portage , meeting the Nechako River at the city of Prince George , then continues south, progressively cutting deeper into the Fraser Plateau to form the Fraser Canyon from roughly the confluence of the Chilcotin River , near the city of Williams Lake , southwards. It

1650-604: The Rocky Mountains and flowing for 1,375 kilometres (854 mi), into the Strait of Georgia just south of the City of Vancouver . The river's annual discharge at its mouth is 112 cubic kilometres (27 cu mi) or 3,550 cubic metres per second (125,000 cu ft/s), and each year it discharges about 20 million tons of sediment into the ocean. The river is named after Simon Fraser , who led an expedition in 1808 on behalf of

1716-564: The San Juan Islands , gaining strength over the open water of the Strait of Juan de Fuca . The estuary at the river's mouth is a site of hemispheric importance in the Western Hemisphere Shorebird Reserve Network . The Water Survey of Canada currently operates 17 gauge stations that measure discharge and water level along the majority of the mainstem from Red Pass just downstream of Moose Lake in

1782-692: The Yukon Ranges . The Boundary Ranges include several large icefields, including the Juneau Icefield between Juneau, Alaska and Atlin Lake in British Columbia, and the Stikine Icecap , which lies between the lower Stikine River and the Whiting River . Because the Coast Mountains are just east of the Pacific Ocean , they have a profound effect on British Columbia's climate by forcing moisture-laden air off

1848-636: The Yukon Territory . Covered in dense temperate rainforest on its western exposures, the range rises to heavily glaciated peaks, including the largest temperate-latitude ice fields in the world. On its eastern flanks, the range tapers to the dry Interior Plateau and the subarctic boreal forests of the Skeena Mountains and Stikine Plateau . The Coast Mountains are part of the Pacific Ring of Fire —the ring of volcanoes and associated mountains around

1914-732: The sagebrush grasslands which typify the southern part of the plateau in the Columbia drainage. The first documented human presence was in 8500 BC . Bison remains, Clovis and other fluted points date back to this time frame. An important sites in the area is at Wenatchee site (located in Washington ). The Windust phase is dated between 10600 BC and 7100 BC. At the Lind Coulee Archaeological Site in east-central Washington, leaf-shaped projectile points and knives date between 8500 and 5500 BC. Based on archaeological evidence, it

1980-680: The Bridge River Ocean, the Insular Islands drew closer to the former continental margin and coastline of western North America, supporting a pre-existing volcanic arc on the former continental margin of North America called the Omineca Arc . As the North American Plate drifted west and the Insular Plate drifted east to the old continental margin of western North America, the Bridge River Ocean eventually closed by ongoing subduction under

2046-421: The Bridge River Ocean. This subduction zone eventually jammed and shut down completely 115 million years ago, ending the Omineca Arc and the Insular Islands collided, forming the Insular Belt . Compression resulting from this collision crushed, fractured and folded rocks along the old continental margin. The Insular Belt then welded onto the pre-existing continental margin by magma that eventually cooled to create

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2112-446: The Coast Range Arc were then deformed under the heat and pressure of later intrusions, turning them into layered metamorphic rock known as gneiss . In some places, mixtures of older intrusive rocks and the original oceanic rocks have been distorted and warped under intense heat, weight and stress to create unusual swirled patterns known as migmatite , appearing to have been nearly melted in the procedure. Volcanism began to decline along

2178-433: The Insular Islands and the former continental margin of North America called the Bridge River Ocean . This arrangement of two parallel subduction zones is unusual in that very few twin subduction zones exist on Earth; the Philippine Mobile Belt off the southeastern coast of Asia is an example of a modern twin subduction zone. As the Insular Plate drew closer to the pre-existing continental margin by ongoing subduction under

2244-456: The Insular Islands. One of the major aspects that changed early during the Coast Range Arc was the status of the northern end of the Farallon Plate, a portion now known as the Kula Plate . About 85 million years ago, the Kula Plate broke off from the Farallon Plate to form a mid-ocean ridge known to geoscientists as the Kula-Farallon Ridge . This change apparently had some important ramifications for regional geologic evolution. When this change

2310-403: The Interior Plateau. North of the Interior Plateau on the range's northeastern slopes lies a huge mountainous area known by geographers as the Interior Mountains , which includes the neighbouring Skeena , Cassiar and Hazelton Mountains . The Coast Mountains consist of deformed igneous and metamorphosed structurally complex pre- Tertiary rocks. These originated in diverse locations around

2376-420: The North Arm, which is the southern boundary of the City of Vancouver , and the South Arm, which divides the City of Richmond from the City of Delta to the south. Richmond is on the largest island in the Fraser, Lulu Island and also on Sea Island , which is the location of Vancouver International Airport , where the Middle Arm branches off to the south from the North Arm. The far eastern end of Lulu Island

2442-433: The Pacific Ocean to rise, dropping heavy rainfalls on the western slopes where lush forests exist. This precipitation is among the heaviest in North America. The eastern slopes are relatively dry and less steep and protect the British Columbia Interior from the Pacific weather systems, resulting in dry warm summers and dry cold winters. Beyond the eastern slopes is a 154,635 km (59,705 sq mi) plateau occupying

2508-408: The adjoining mountain ranges, are the Shuswap Highland , Okanagan Highland and Quesnel Highland . The location of the Interior Plateau in North America is between the Rocky Mountains and the Pacific Coast Ranges. It is cut by the basins and tributaries of two rivers: the Columbia and the Fraser . The northern region is largely wooded, except in lowland and more southerly areas which resemble

2574-462: The coast. When an Arctic high-pressure area moves into the British Columbia Interior and a relatively low-pressure area builds over the general Puget Sound and Strait of Georgia region, the cold Arctic air accelerates southwest through the Fraser Canyon . These outflow winds can gust up to 97 to 129 kilometres per hour (60 to 80 mph) and have at times exceeded 160 kilometres per hour (100 mph). Such winds frequently reach Bellingham and

2640-427: The definition of this region such as the following: Some classifications systems assign the Pattullo Rangez to the Hazelton Mountains , which are part of the larger Skeena Mountains complex, but then theoretically so zalso is the Quanchus Range. Also, the Cariboo Mountains are sometimes included as part of the Interior Plateau. Three areas liminal to the plateau, i.e. sometimes considered part of it rather than

2706-417: The early Eocene period. Volcanism along the entire length of the Coast Range Arc shut down about 50 million years ago and many of the volcanoes have disappeared from erosion. What remains of the Coast Range Arc to this day are outcrops of granite when magma intruded and cooled at depth beneath the volcanoes, forming the present Coast Mountains. During construction of intrusions 70 and 57 million years ago,

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2772-408: The estuary, most notably Westham Island , a wildfowl preserve, and Iona Island , the location of the main sewage plant for the City of Vancouver. After 100 kilometres (about 60 mi), the Fraser forms a delta where it empties into the Strait of Georgia between the mainland and Vancouver Island . The lands south of the City of Vancouver , including the cities of Richmond and Delta , sit on

2838-413: The first Europeans to find and enter it. The existence of the river, but not its location, had been deduced during the 1791 voyage of José María Narváez , under Francisco de Eliza . The upper reaches of the Fraser River were first explored by Sir Alexander Mackenzie in 1793, and fully traced by Simon Fraser in 1808, who confirmed that it was not connected with the Columbia River . The lower Fraser

2904-460: The flat flood plain . The islands of the delta include Iona Island, Sea Island, Lulu Island, Annacis Island, and a number of smaller islands. While the vast majority of the river's drainage basin lies within British Columbia, a small portion in the drainage basin lies across the international border in Washington in the United States, namely the upper reaches of the tributary Chilliwack and Sumas rivers. Most of lowland Whatcom County, Washington

2970-464: The flood problems, but over time, the dykes were allowed to fall into disrepair and became overgrown with brush and trees. With some dykes constructed of a wooden frame, they gave way in 1948 in several locations, marking the second disastrous flood. Flooding since 1948 has been minor in comparison. 1948 saw massive flooding in Chilliwack and other areas along the Fraser River. The high-water mark at Mission rose to 7.5 metres (24.7 ft). The peak flow

3036-443: The flow during the winter. The Fraser's highest recorded flow, in June 1894, is estimated to have been 17,000 cubic metres per second (600,000 cu ft/s) at Hope . It was calculated using high-water marks near the hydrometric station at Hope and various statistical methods. In 1948 the Fraser River Board adopted the estimate for the 1894 flood. It remains the value specified by regulatory agencies for all flood control work on

3102-407: The globe: the area is built of several different terranes of different ages with a broad range of tectonic origins. In addition, oceanic crust under the Pacific Ocean is being subducted at the southern portion of the range to form a north–south line of volcanoes called the Garibaldi Volcanic Belt , a northern extension of the Cascade Volcanoes in the northwestern United States , and contains

3168-407: The length of the arc about 60 million years ago during the Albian and Aptian faunal stages of the Cretaceous period. This resulted from the changing geometry of the Kula Plate, which progressively developed a more northerly movement along the Pacific Northwest . Instead of subducting beneath the Pacific Northwest, the Kula Plate began subducting underneath southwestern Yukon and Alaska and during

3234-407: The low-lying areas not protected by dikes in the Lower Mainland . However, the water levels did not breach the dikes, and major flooding was averted. Major flooding occurred in November 2021 as part of the November 2021 Pacific Northwest floods . Tributaries are listed from the mouth of the Fraser and going up river. Interior Plateau The Interior Plateau comprises a large region of

3300-427: The most explosive young volcanoes in Canada. Further north the northwesterly structural trend of the Coast Mountains lies partly in a large continental rift responsible for the creation of several volcanoes. These volcanoes form part of the Northern Cordilleran Volcanic Province , the most volcanically active area in Canada. The first event began 130 million years ago when a group of active volcanic islands approached

3366-458: The northern motion of the Kula Plate might have been between 140 mm (6 in) and 110 mm (4 in) per year. However, other geologic studies determined the Kula Plate moved at a rate as fast as 200 mm (8 in) per year. Download coordinates as: Fraser River The Fraser River ( / ˈ f r eɪ z ər / ) is the longest river within British Columbia , Canada, rising at Fraser Pass near Blackrock Mountain in

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3432-437: The poorly maintained dyke systems failed to contain the water. At the height of the 1948 flood, 200 square kilometres (50,000 acres) stood under water. Dykes broke at Agassiz, Chiliwack, Nicomen Island, Glen Valley and Matsqui. When the flood waters receded a month later, 16,000 people had been evacuated, with damages totaling $ 20 million, about $ 225 million in 2020 dollars. Major flooding occurred once again in 1972 due to

3498-476: The river was designated as a Canadian Heritage River for its natural and human heritage. It remains the longest river with that designation. The Fraser is heavily exploited by human activities, especially in its lower reaches. Its banks are rich farmland, its water is used by pulp mills , and a few dams on some tributaries provide hydroelectric power . The main flow of the Fraser has never been dammed partly because its high level of sediment flows would result in

3564-411: The river, not dissimilar to the Dakelh name, is ʔElhdaqox , meaning Sturgeon ( ʔElhda-chugh ) River ( Yeqox ) . The Fraser drains a 220,000-square-kilometre (85,000 sq mi) area. Its source is a dripping spring at Fraser Pass in the Canadian Rocky Mountains near the border with Alberta . The river then flows north to the Yellowhead Highway and west past Mount Robson to

3630-404: The river. Further studies and hydraulic models have estimated the maximum discharge of the Fraser River, at Hope during the 1894 flood, as within a range of about 16,000 to 18,000 cubic metres per second (570,000 to 640,000 cu ft/s). On June 14, 1792, the Spanish explorers Dionisio Alcalá Galiano and Cayetano Valdés entered and anchored in the North Arm of the Fraser River, becoming

3696-446: The south to the Nass River in the north. The third and northernmost subdivision of the Coast Mountains is the Boundary Ranges , extending from the Nass River in the south to the Kelsall River in the north. It is also the largest subdivision of the Coast Mountains, spanning the British Columbia-Alaska border and northwards into Yukon flanking the west side of the Yukon River drainage as far as Champagne Pass , north of which being

3762-417: The southern and central portions of British Columbia called the Interior Plateau . Included within the Interior Plateau is a coalescing series of layered flood basalt lava flows. These sequences of fluid volcanic rock cover about 25,000 km (9,700 sq mi) of the Interior Plateau and have a volume of about 1,800 km (430 cu mi), forming a large volcanic plateau constructed atop of

3828-655: The tramway. Simon Fraser was forced to portage the gorge on his trip through the canyon in June 1808. At Yale , at the head of navigation on the river, the canyon opens up and the river widens, though without much adjoining lowland until Hope , where the river then turns west and southwest into the Fraser Valley , a lush lowland valley, and runs past Chilliwack and the confluence of the Harrison and Sumas Rivers , bending northwest at Abbotsford and Mission . The Fraser then flows past Maple Ridge , Pitt Meadows , Port Coquitlam , and north Surrey . It turns southwest again just east of New Westminster , where it splits into

3894-428: The zone of Cretaceous dextral thrust faulting appears to have been widespread. It was also during this period when massive amounts of molten granite intruded highly deformed ocean rocks and assorted fragments from pre-existing island arcs, largely remnants of the Bridge River Ocean. This molten granite burned the old oceanic sediments into a glittering medium-grade metamorphic rock called schist . The older intrusions of

3960-406: Was about 15,600 cubic meters per second. Cool temperatures in March, April, and early May had delayed the melting of the heavy snowpack that had accumulated over the winter season. Several days of hot weather and warm rains over the holiday weekend in late May hastened the thawing of the snowpack. Rivers and streams quickly swelled with spring runoff, reaching heights surpassed only in 1894. Finally,

4026-421: Was caught and released on the Fraser River in July 2012. In 2021, a white sturgeon was caught on the river weighing 890 pounds (400 kg), with a length of 352 cm (11.55 ft). It was estimated to be over 100 years old. The fish was tagged and released. The most significant Fraser river floods in recorded history occurred in 1894 and 1948. After European settlement, the first disastrous flood in

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4092-472: Was completed, Coast Range Arc volcanism returned and sections of the arc were uplifted considerably in latest Cretaceous time. This started a period of mountain building that affected much of western North America called the Laramide orogeny . In particular a large area of dextral transpression and southwest-directed thrust faulting was active from 75 to 66 million years ago. Much of the record of this deformation has been overridden by Tertiary age structures and

4158-435: Was found for this group, dating between 5500 and 4300 BC. Other pithouses followed between 4000 and 2000 BC. Most residential structures are located on rivers. During the historic era, plants and salmon were the staple foods, which give us an indication that Cascade groups harvested salmon runs in the summer and fall. The Late Period, dated to about 2500 BC , the pithouse ( quiggly hole ) came into existence, such as those at

4224-411: Was revisited in 1824 when the Hudson's Bay Company sent a crew across Puget Sound from its Fort George southern post on the Columbia River . The expedition was led by James McMillan . The Fraser was reached via the Nicomekl River and the Salmon River reachable after a portage. Friendly tribes met earlier on by the Simon Fraser crew were reacquainted with. A trading post with agricultural potential

4290-421: Was the site of its first recorded settlements of Aboriginal people ( see Musqueam , Sto:lo , St'at'imc , Secwepemc and Nlaka'pamŭ ), the site of the first European-Indigenous mixed ancestry settlement in southern British-Columbia ( see Fort Langley ), the route of multitudes of prospectors during the Fraser Canyon Gold Rush and the main vehicle of the province's early commerce and industry. In 1998,

4356-462: Was to be located. By 1827, a crew was sent back via the mouth of the Fraser to build and operate the original Fort Langley . McMillan also led the undertaking. The trading post original location would soon become the first ever mixed ancestry and agricultural settlement in southern British Columbia on the Fraser (Sto:lo) river. In 1828 George Simpson visited the river, mainly to examine Fort Langley and determine whether it would be suitable as

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