|- location||Rocky Mountains, Montana|
|- elevation||3,337 ft (1,017 m)|
|- location||Thompson Falls, Montana|
|- elevation||2,405 ft (733 m)|
The Thompson River is a tributary of the Clark Fork in the U.S. state of Montana. It is part of the Columbia River basin, as Clark Fork is a tributary of the Pend Oreille River, which is a tributary of the Columbia River.
A tributary or affluent is a stream or river that flows into a larger stream or main stem 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.
In the United States, a state is a constituent political entity, of which there are currently 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory and shares its sovereignty with the federal government. Due to this shared sovereignty, Americans are citizens both of the federal republic and of the state in which they reside. State citizenship and residency are flexible, and no government approval is required to move between states, except for persons restricted by certain types of court orders. Four states use the term commonwealth rather than state in their full official names.
Montana is a landlocked state in the Northwestern United States. Montana has several nicknames, although none are official, including "Big Sky Country" and "The Treasure State", and slogans that include "Land of the Shining Mountains" and more recently "The Last Best Place".
The Thompson River is named in honor of David Thompson.
David Thompson was a British-Canadian fur trader, surveyor, and map-maker, known to some native peoples as Koo-Koo-Sint or "the Stargazer." Over Thompson's career, he travelled some 90,000 kilometres (56,000 mi) across North America, mapping 4.9 million square kilometres of North America along the way. For this historic feat, Thompson has been described as the "greatest land geographer who ever lived."
The Thompson River originates in Upper Thompson Lake and flows generally south to join Clark Fork near the town of Thompson Falls.
Thompson Falls is a city in and the county seat of Sanders County, Montana, United States. The population was 1,313 at the 2010 census.
The Calapooia River is an 80-mile (130 km) tributary of the Willamette River in the U.S. state of Oregon.
The Clark Fork, or the Clark Fork of the Columbia River, is a river in the U.S. states of Montana and Idaho, approximately 310 miles (500 km) long. The largest river by volume in Montana, it drains an extensive region of the Rocky Mountains in western Montana and northern Idaho in the watershed of the Columbia River. The river flows northwest through a long valley at the base of the Cabinet Mountains and empties into Lake Pend Oreille in the Idaho Panhandle. The Pend Oreille River in Idaho, Washington, and British Columbia, Canada which drains the lake to the Columbia in Washington, is sometimes included as part of the Clark Fork, giving it a total length of 479 miles (771 km), with a drainage area of 25,820 square miles (66,900 km2). In its upper 20 miles (32 km) in Montana near Butte, it is known as Silver Bow Creek. Interstate 90 follows much of the upper course of the river from Butte to northwest of Missoula. The highest point within the river's watershed is Mount Evans at 10,641 feet (3,243 m) in Deer Lodge County, Montana along the Continental Divide.
The Dirty Devil River is an 80-mile-long (130 km) tributary of the Colorado River, located in the U.S. state of Utah. It flows through southern Utah from the confluence of the Fremont River and Muddy Creek before emptying into the Colorado River at Lake Powell.
The Skipanon River is a tributary of the Columbia River, approximately 7 miles (11 km) long, on the Pacific coast of northwest Oregon in the United States. It is the last tributary of the Columbia on the Oregon side, draining an area of coastal bottom land bordered by sand dunes and entering the river from the south at its mouth west of Astoria.
The Youngs River is a tributary of the Columbia River, approximately 27 miles (43 km) long, in northwest Oregon in the United States. It drains part of the Northern Oregon Coast Range in the extreme northwest corner of state, entering the Columbia via Youngs Bay just approximately 10 miles (16 km) from its mouth.
The Lewis River is a tributary of the Columbia River, about 95 miles (153 km) long, in southwestern Washington in the United States. It drains part of the Cascade Range north of the Columbia River. The drainage basin of the Lewis River covers about 1,046 square miles (2,709 km2). The river's mean annual discharge is about 6,125 cubic feet per second (173.4 m3/s). Unlike nearby Lewis County and Fort Lewis the Lewis River was not named for Meriwether Lewis, but rather for A. Lee Lewis, an early settler who homesteaded near the mouth of the river.
The Klickitat River is a tributary of the Columbia River, nearly 96 miles (154 km) long, in south-central Washington in the United States. It drains a rugged plateau area on the eastern side of the Cascade Range northeast of Portland, Oregon. In 1986, 10 miles (16 km) of the river were designated Wild and Scenic from the confluence with Wheeler Creek, near the town of Pitt, to the confluence with the Columbia River.
The Wind River is a tributary of the East Fork Chandalar River in the U.S. state of Alaska. It arises in the Philip Smith Mountains of the Brooks Range and flows into the East Fork and eventually into the Yukon River.
The Squamish River is a short but very large river in the Canadian province of British Columbia. Its drainage basin is 3,328 square kilometres (1,285 sq mi) in size. The total length of the Squamish River is approximately 80 kilometres (50 mi).
The Elaho River is a c.70 km long river beginning in the Coast Mountains northwest of the towns of Whistler and Pemberton, British Columbia. It is a tributary of the Squamish River and is known for its whitewater rafting and kayaking as well as for the intense alpine scenery lining its route.
The Mamquam River is a c.35 km tributary of the Squamish River.
The Kalama River is a 45-mile (72 km) tributary of the Columbia River, in the U.S. state of Washington. It flows entirely within Cowlitz County, Washington. Calama River is an old variant name.
The Coweeman River is a tributary of the Cowlitz River, in the South West corner of the U.S. state of Washington. Its name comes from the Cowlitz word ko-wee-na, meaning "short one", referring to a short Indian who once lived along the river.
Ashlu Creek is a short and swift river-like creek in British Columbia. It is a tributary of the Squamish River and enters it about 24.3 km northwest of Squamish.
Clendinning Creek is a river in British Columbia. It is the largest tributary of the Elaho River. It is located entirely within Clendinning Provincial Park.
The Emerald River is a short river in British Columbia. It is about 6.5 kilometres (4.0 mi) long and drains the waters of Emerald Lake to the Kicking Horse River. The river exits the lake’s south end and flows in a southern direction for about 6.5 kilometres (4.0 mi) to its mouth, which is at almost exactly the same place as the mouth of the Amiskwi River. It picks up three named tributaries; Hamilton Creek, Russell Creek and Kendel Creek.
The North Fork Breitenbush River is a tributary of the Breitenbush River in the U.S. state of Oregon. It begins at Papoose Lakes near Breitenbush Lake in the Cascade Range north of Mount Jefferson and flows generally northwest and west through the Mount Hood National Forest, Olallie Scenic Area, Mount Jefferson Wilderness, and Willamette National Forest. It merges with the South Fork Breitenbush River to form the Breitenbush River main stem slightly upstream of Breitenbush Hot Springs.
The Green River is a tributary of Five Rivers in the U.S. state of Oregon. It arises in the Siuslaw National Forest of the Central Oregon Coast Range and flows generally northeast to meet Five Rivers upstream of the rural community of Fisher. The confluence is about 15 miles (24 km) from the larger stream's confluence with the Alsea River. The Green River's named tributaries from source to mouth are the East Fork Green River and Ryan Creek.
The East Fork South Fork McKenzie River is a tributary of the South Fork McKenzie River in Lane County in the U.S. state of Oregon. It begins in and passes through part of the Willamette National Forest of the Cascade Range. Flowing generally northwest along the base of Sawtooth Ridge, it empties into Cougar Reservoir on the South Fork McKenzie River, about 5 miles (8 km) upstream of that stream's mouth on the McKenzie River.
The South Fork Wenaha River is a tributary of the Wenaha River in the U.S. state of Oregon. The river begins in the Blue Mountains south of Bone Spring in Wallowa County near its border with Union County. From there it flows generally northeast through the Wenaha–Tucannon Wilderness of the Umatilla National Forest to meet the North Fork Wenaha River. The combined forks form the main stem Wenaha, a tributary of the Grande Ronde River.
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