The Powder River is a tributary of the

Snake River The Snake River is a major river of the greater Pacific Northwest region in the United States. At long, it is the largest tributary of the Columbia River, in turn, the largest North American river that empties into the Pacific Ocean. The Snake ...

, approximately long,U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data
The National Map
accessed May 3, 2011 in northeast

Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

in the United States. It drains an area of the

Columbia Plateau The Columbia Plateau is a geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho. It is a wide flood basalt plateau between the Cascade Range and the Rocky Mountains, cut through by the Columbia ...

on the eastern side of the Blue Mountains. It flows almost entirely within Baker County but downstream of the city of North Powder forms part of the border between Baker County and Union County.

Name

The name ''Powder River'' is first recorded in the journals of

Peter Skene Ogden Peter Skene Ogden (alternately Skeene, Skein, or Skeen; baptised 12 February 1790 – 27 September 1854) was a British-Canadian fur trader and an early explorer of what is now British Columbia and the Western United States. During his many expedi ...

without notation of the origin of the name. Explorer Donald Mackenzie likely named the river. William C. McKay, grandson of

John Jacob Astor John Jacob Astor (born Johann Jakob Astor; July 17, 1763 – March 29, 1848) was a German-American businessman, merchant, real estate mogul, and investor who made his fortune mainly in a fur trade monopoly, by smuggling opium into China, and ...

's partner

Alexander MacKay Alexander is a male given name. The most prominent bearer of the name is Alexander the Great, the king of the Ancient Greek kingdom of Macedonia who created one of the largest empires in ancient history. Variants listed here are Aleksandar, Al ...

, says that the origin of the name is from the powdery and sandy soil along the shores of the river, from the Chinook Jargon ''polalle illahe''. It appears on

Lewis and Clark Lewis may refer to: Names * Lewis (given name), including a list of people with the given name * Lewis (surname), including a list of people with the surname Music * Lewis (musician), Canadian singer * "Lewis (Mistreated)", a song by Radiohead ...

's maps as ''Port-pel-lah''.

Course

The Powder River's tributaries arise in the southern Blue Mountains in the

Umatilla National Forest The Umatilla National Forest, in the Blue Mountains of northeast Oregon and southeast Washington, covers an area of 1.4 million acres (5,700 km2). In descending order of land area the forest is located in parts of Umatilla, Grant, Columbi ...

. The river's

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 ...

begins in Sumpter, where McCully Fork, Cracker Creek and several smaller tributaries join, and flows east-southeast through the tailings of past dredge mining and into Phillips Reservoir. After exiting Phillips Reservoir, the river continues east for about before turning sharply north through the Bowen Valley and Baker City, Oregon. From here the river meanders the floor of the Baker Valley and passes by the cities of Haines and North Powder, where it is joined by the North Powder River. Here the river turns again sharply east-southeast, flowing through Thief Valley Reservoir, in a valley along the southern edge of the

Wallowa Mountains The Wallowa Mountains () are a mountain range located in the Columbia Plateau of northeastern Oregon in the United States. The range runs approximately northwest to southeast in southwestern Wallowa County and eastern Union County between the ...

. The river then transits the Lower Powder Valley and enters the Snake River on the Idaho–Oregon state line from the west, upstream from the Brownlee Dam at the Powder Arm of Brownlee Reservoir downstream from Richland.

Tributaries

Major streams flowing into the Powder are Eagle Creek, Wolf Creek, Rock Creek and the North Powder River.

Watershed

The Powder River watershed drains of northeastern Oregon. There are three man-made reservoirs on the Powder River: Phillips Reservoir (behind Mason Dam), Thief Valley Reservoir, and also the Powder arm of Brownlee Reservoir at the Oregon–

Idaho Idaho ( ) is a state in the Pacific Northwest region of the Western United States. To the north, it shares a small portion of the Canada–United States border with the province of British Columbia. It borders the states of Montana and Wyom ...

border at the confluence of the Powder and Snake Rivers. In 1988, of the Powder River was designated

Wild and Scenic The National Wild and Scenic Rivers System was created by the Wild and Scenic Rivers Act of 1968 (Public Law 90-542), enacted by the U.S. Congress to preserve certain rivers with outstanding natural, cultural, and recreational values in a free- ...

. Between the Thief Valley Dam and the

Oregon Route 203 Oregon Route 203 is an Oregon state highway running from Interstate 84 near La Grande to I-84 near Baker City. OR 203 is composed of part of the La Grande-Baker Highway No. 66 (see Oregon highways and routes) and the Medical Springs Highway No. ...

bridge, this stretch flows through a rugged canyon with spectacular geologic formations.

Flora and fauna

Beaver Beavers are large, semiaquatic rodents in the genus ''Castor'' native to the temperate Northern Hemisphere. There are two extant species: the North American beaver (''Castor canadensis'') and the Eurasian beaver (''C. fiber''). Beavers ar ...

(''Castor canadensis'') populations are increasing along the river, with an excellent viewing area just off

Oregon Route 7 Oregon Route 7 is an Oregon state highway which runs from Interstate 84 at Baker City to U.S. Route 26 at Austin Junction. OR 7 traverses several highways of the Oregon state highway system: Whitney Highway No. 71, part of the La G ...

below Mason Dam, about from Baker City. There, a colony of beavers constructed a large dam easily viewed below the footbridge adjacent to the paved parking area. Recovered from near extirpation by the

Hudson's Bay Company The Hudson's Bay Company (HBC; french: Compagnie de la Baie d'Hudson) is a Canadian retail business group. A fur trading business for much of its existence, HBC now owns and operates retail stores in Canada. The company's namesake business div ...

, who tried to create a "fur desert" to discourage Americans from coming to the far western states, benefits of beaver in arid eastern Oregon include creating ponds which along young salmonids to grow, raising the water table as their ponds recharge groundwater supplies and creating wetlands which trap sediment and pollutants. The Powder River was once an important spawning stream for

Chinook salmon The Chinook salmon (''Oncorhynchus tshawytscha'') is the largest and most valuable species of Pacific salmon in North America, as well as the largest in the genus ''Oncorhynchus''. Its common name is derived from the Chinookan peoples. Other ve ...

(''Oncorhynchus tshawytscha'') and

steelhead trout Steelhead, or occasionally steelhead trout, is the common name of the anadromous form of the coastal rainbow trout or redband trout (O. m. gairdneri). Steelhead are native to cold-water tributaries of the Pacific basin in Northeast Asia and N ...

(''Oncorhyncus mykiss'') coming from the Pacific Ocean. Chinook salmon once migrated by the thousands to spawn in the Powder River and many of its tributaries from its headwaters to the lower end of the North Powder Valley, but that stopped when the Thief Valley Dam was built near North Powder in 1931. The building of two later dams in

Hells Canyon Hells Canyon is a canyon in the Western United States, located along the border of eastern Oregon, a small section of eastern Washington and western Idaho. It is part of the Hells Canyon National Recreation Area which is also located in p ...

on the Snake River – Hells Canyon Dam (1967) and

Brownlee Dam Brownlee Dam is a hydroelectric earth fill embankment dam in the western United States, on the Snake River along the Idaho-Oregon border. In Hells Canyon at river mile 285, it impounds the Snake River in the Brownlee Reservoir. It is part of ...

also permanently block salmon passage. The

Oregon Department of Fish and Wildlife The Oregon Department of Fish and Wildlife (ODFW) is a government agency of the U.S. state of Oregon responsible for programs protecting Oregon fish and wildlife resources and their habitats. The agency operates hatcheries, issues hunting and ...

often release Chinook salmon on the Powder River for sportfishing at Mason Dam below Phillips Reservoir.

References

External links

Powder Basin Watershed CouncilNational Wild and Scenic Rivers System
{{authority control Rivers of Oregon Wild and Scenic Rivers of the United States Tributaries of the Snake River Rivers of Baker County, Oregon Rivers of Union County, Oregon