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Willamette River
The Willamette River ( ) is a major tributary of the Columbia River, accounting for 12 to 15 percent of the Columbia's flow. The Willamette's main stem is long, lying entirely in northwestern Oregon in the United States. Flowing northward between the Oregon Coast Range and the Cascade Range, the river and its tributaries form the Willamette Valley, a basin that contains two-thirds of Oregon's population, including the state capital, Salem, and the state's largest city, Portland, which surrounds the Willamette's mouth at the Columbia. Originally created by plate tectonics about 35 million years ago and subsequently altered by volcanism and erosion, the river's drainage basin was significantly modified by the Missoula Floods at the end of the most recent ice age. Humans began living in the watershed over 10,000 years ago. There were once many tribal villages along the lower river and in the area around its mouth on the Columbia. Indigenous peoples lived throughout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clackamas People
The Clackamas Indians are a tribe of Native Americans of the U.S. state of Oregon who traditionally lived along the Clackamas River in the Willamette Valley. Lewis and Clark estimated their population at 1800 in 1806. At the time the tribe lived in 12 villages that occupied from the lower Columbia River to an area what is now called Oregon City. They resided towards the east side of the Willamette River given this length of land. In February 1841, Reverend François Norbert Blanchet and Reverend Alvin F. Waller converted Clackamas Chief Popoh. In fall of 1851, a treaty was never ratified by Oregon superintendent, Anson Dart. Another treaty was signed on January 10, 1855 and was ratified March 3, 1855. The Clackamas were to be granted twenty-five hundred dollars of resources, which only a fifth was paid. Lifestyle The tribe subsisted on fish and roots. The Indians would construct large platforms made from cedar in order to dip their nets in over Willamette Falls. This form of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multnomah County, Oregon
Multnomah County is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the county's population was 815,428. Multnomah County is part of the Portland–Vancouver– Hillsboro, OR–WA Metropolitan Statistical Area. Though smallest in area, Multnomah County is the state's most populous county. Its county seat, Portland, is the state's largest city. History The area of the lower Willamette River has been inhabited for thousands of years, including by the Multnomah band of Chinookan peoples long before European contact, as evidenced by the nearby Cathlapotle village, just downstream. Multnomah County (the thirteenth in Oregon Territory) was created on December 22, 1854, formed out of two other Oregon counties – the eastern part of Washington County and the northern part of Clackamas County. Its creation was a result of a petition earlier that year by businessmen in Portland complaining of the inconvenient location of the Washington County seat in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oregon Coast Range
The Oregon Coast Range, often called simply the Coast Range and sometimes the Pacific Coast Range, is a mountain range, in the Pacific Coast Ranges physiographic region, in the U.S. state of Oregon along the Pacific Ocean. This north-south running range extends over from the Columbia River in the north on the border of Oregon and Washington, south to the middle fork of the Coquille River. It is wide and averages around in elevation above sea level. The coast range has three main sections, a Northern, Central, and Southern. The oldest portions of the range are over 60 million years old, with volcanics and a forearc basin as the primary mountain building processes responsible for the range. It is part of the larger grouping known as the Pacific Coast Ranges that extends over much of the western edge of North America from California to Alaska. The range creates a rain shadow effect for the Willamette Valley that lies to the east of the mountains, creating a more stable climate a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Main Stem
In hydrology, a mainstem (or trunk) is "the primary downstream segment of a river, as contrasted to its tributaries". Water enters the mainstem from the river's drainage basin, the land area through which the mainstem and its tributaries flow.. A drainage basin may also be referred to as a ''watershed'' or ''catchment''. Hydrological classification systems assign numbers to tributaries and mainstems within a drainage basin. In the Strahler number, a modification of a system devised by Robert E. Horton in 1945, channels with no tributaries are called "first-order" streams. When two first-order streams meet, they are said to form a second-order stream; when two second-order streams meet, they form a third-order stream, and so on. In the Horton system, the entire mainstem of a drainage basin was assigned the highest number in that basin. However, in the Strahler system, adopted in 1957, only that part of the mainstem below the tributary of the next highest rank gets the highest num ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tributary
A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage basin of its surface water and groundwater, leading the water out into an ocean. The Irtysh is a chief tributary of the Ob river and is also the longest tributary river in the world with a length of . The Madeira River is the largest tributary river by volume in the world with an average discharge of . A confluence, where two or more bodies of water meet, usually refers to the joining of tributaries. The opposite to a tributary is a distributary, a river or stream that branches off from and flows away from the main stream. PhysicalGeography.net, Michael Pidwirny & S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clackamas River
The Clackamas River is an approximately tributary of the Willamette River in northwestern Oregon, in the United States. Draining an area of about , the Clackamas flows through mostly forested and rugged mountainous terrain in its upper reaches, and passes agricultural and urban areas in its lower third. The river rises in eastern Marion County, about east-southeast of Salem. The headwaters are on the slopes of Olallie Butte in the Mount Hood National Forest, about north of Mount Jefferson, at an elevation of in the Cascade Range. The Clackamas flows briefly north and then flows northwest through the mountains, passing through North Fork Reservoir and Estacada. It then emerges from the mountains southeast of Portland. It joins the Willamette near Oregon City and forms the boundary between Oregon City and Gladstone. The Clackamas provides hydroelectric power and drinking water for some of the Portland metropolitan area, and it supports runs of Coho salmon, spring and fall C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Molalla River
The Molalla River is a tributary of the Willamette River in the northwestern part of Oregon in the United States. Flowing northwest from the Cascade Range through Table Rock Wilderness, it passes the city of Molalla before entering the larger river near Canby. The Molalla is the largest Willamette tributary unblocked by a dam. Course The river's headwaters are in Clackamas County, near the Table Rock Wilderness, in the Cascade Range. Flowing generally north-northwest from the mountains, the river enters the Willamette Valley and flows past the city of Molalla. It is joined by the Pudding River shortly before entering the Willamette near the city of Canby. The confluence is about from the Willamette's mouth on the Columbia River. The map includes mile markers along the Willamette River and most of the Molalla River. The Molalla River is the largest free-flowing tributary of the Willamette. Named tributaries from source to mouth are Henry, Ogle, Mining Iron, Lake, Scorpion, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Santiam River
The Santiam River is a tributary of the Willamette River, about long, in western Oregon in the United States. Through its two principal tributaries, the North Santiam and the South Santiam rivers, it drains a large area of the Cascade Range at the eastern side of the Willamette Valley east of Salem and Corvallis. Watershed The main course of the river is short, formed in the Willamette Valley by the confluence of the North and South Santiam rivers on the border between Linn and Marion counties approximately northeast of Albany. It flows generally west-northwest in a slow meandering course to join the Willamette from the east approximately north of Albany. Both the North and South Santiam rise in high Cascades in eastern Linn County. The Middle Santiam River joins the South Santiam where the South Santiam is impounded to form Foster Lake. The North Santiam is impounded to form the deep Detroit Lake in the Cascades. The Santiam is a major source of water supply for Salem. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calapooia River
The Calapooia River is an tributary of the Willamette River in the U.S. state of Oregon. The Calapooia flows generally northwest from its source in the Cascade Range near Tidbits Mountain. In its upper reaches, it passes through parts of the Willamette National Forest. Further downstream, it flows through Holley then Crawfordsville and Brownsville in the Willamette Valley before joining the Willamette at Albany. The city of Tangent is also near the river on a branch of one of its downstream tributaries, Lake Creek. The confluence of the two rivers is about by water from where the Willamette joins the Columbia River The map includes mile markers along the Calapooia and Willamette rivers. The Calapooia was named for the Kalapuya (also spelled Calapooia), a tribe of Native Americans. Tributaries Named tributaries of the river from source to mouth are Eighteen, Treadwell, and United States creeks followed by the North Fork Calapooia River. Then come King, Potts, Barrett/Hands ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
McKenzie River (Oregon)
The McKenzie River is a tributary of the Willamette River in western Oregon in the United States. It drains part of the Cascade Range east of Eugene and flows westward into the southernmost end of the Willamette Valley. It is named for Donald McKenzie, a Scottish Canadian fur trader who explored parts of the Pacific Northwest for the Pacific Fur Company in the early 19th century. As of the 21st century, six large dams have been built on the McKenzie and its tributaries."About the McKenzie Watershed" McKenzie Watershed Council. Retrieved January 9, 2010. Course The McKenzie River originates as the outflow of Clear Lake in the high[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tualatin River
The Tualatin River is a tributary of the Willamette River in Oregon in the United States. The river is about long, and it drains a fertile farming region called the Tualatin Valley southwest and west of Portland, Oregon, Portland at the northwest corner of the Willamette Valley. There are approximately 500,000 people residing on 15 percent of the land in the river's watershed. Course The Tualatin River arises near Windy Point on the eastern side of the Northern Oregon Coast Range. It begins in the Tillamook State Forest in Washington County and flows about to the Willamette River near West Linn in Clackamas County. The maps, which include river mile (RM) markers from the mouth to RM 76.7 or river kilometer (RK) 123.4, cover the following quadrants from mouth to source: Canby, Lake Oswego, Beaverton, Scholls, Hillsboro, Laurelwood, Forest Grove, Gaston, Turner Creek, and Gobblers Knob. Along the way, it falls from about above sea level to about , most of that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yamhill River
The Yamhill River is an tributary of the Willamette River, in the U.S. state of Oregon. Formed by the confluence of the South Yamhill River and the North Yamhill River about east of McMinnville, it drains part of the Northern Oregon Coast Range. The river meanders east past Dayton to join the Willamette River at its river mile (RM) 55 or river kilometer (RK) 89, south of Newberg. It is likely that Yamhill was the 19th century white settlers' name for a tribe of Native Americans, a Kalapuya people who inhabited the region. The Yamhill people were among 27 bands and tribes moved to the Grand Ronde Indian Reservation, formally established in 1857. Course Formed by the confluence of the South Yamhill and North Yamhill rivers about east of McMinnville, the main stem Yamhill River flows generally east for about to the Willamette River, a tributary of the Columbia River. At about RM 9 (RK 14), Hawn Creek and then Millican Creek enter from the left a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
