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Palouse River
Palouse River
	Several miles downstream from its fork in Colfax; looking west in 2007
	Palouse River's mouth in Washington
Location
Country	United States
State	Washington, Idaho
County	Franklin, Whitman, Adams, Latah
Physical characteristics
Source	Rocky Mountains
• coordinates	46°58′07″N 116°27′31″W / 46.9685°N 116.4587°W
Mouth	Snake River
• coordinates	46°35′24″N 118°12′55″W / 46.59000°N 118.21528°W
• elevation	541 ft (165 m)
Length	167 mi (269 km)
Basin size	3,303 sq mi (8,550 km2)
Discharge
• location	river mile 19.6 at Hooper
• average	599 cu ft/s (17.0 m3/s)
• minimum	0 cu ft/s (0 m3/s)
• maximum	33,500 cu ft/s (950 m3/s)

The Palouse River is a tributary of the Snake River in Washington and Idaho, in the northwest United States. It flows for 167 miles (269 km)^[6] southwestwards, primarily through the Palouse region of southeastern Washington. It is part of the Columbia River Basin, as the Snake River is a tributary of the Columbia River.

Its canyon was carved out by a fork in the catastrophic Missoula Floods of the previous ice age, which spilled over the northern Columbia Plateau and flowed into the Snake River, eroding the river's present course in a few thousand years.

Course

Palouse River entering the Snake at Lyon's Ferry near Starbuck, looking north in 2006

The Palouse River flows from northern Idaho into southeast Washington through the Palouse region, named for the river.

The river originates in Idaho in northeastern Latah County, in the Hoodoo Mountains in the St. Joe National Forest. It flows westward, near State Highway 6, as it nears the state line. In Washington, the river flows in Whitman County to Palouse and then to Colfax, where it meets its South Fork, which originates on the south slopes of Moscow Mountain of the Palouse Range, flows south of Moscow and west to Pullman. (Paradise Creek parallels the South Fork, running through Moscow to Pullman, accompanied by the Bill Chipman Palouse Trail and State Route 270.)

From Colfax, the river meanders west and ends up in the lower Snake River southwest of Hooper, but not before dropping two hundred feet (60 m) over Palouse Falls. The Palouse River enters the Snake River below the Little Goose Dam and above the Lower Monumental Dam.

Basin and discharge

The Palouse River's drainage basin is 3,303 square miles (8,550 km²) in area.^[2] Its mean annual discharge, as measured by USGS gage 13351000 at Hooper (river mile 19.6), is 599 cubic feet per second (17 m³/s), with a maximum daily recorded flow of 27,800 cu ft/s (787 m³/s), and a minimum of zero flow.^[3]

Geology

The Missoula Floods that swept periodically across eastern Washington and across the Columbia River Plateau during the Pleistocene epoch carved out the Palouse River Canyon, which is 1,000 feet (300 m) deep in places.^[7]^[8]^[9]

The ancestral Palouse River flowed through the now-dry Washtucna Coulee directly into the Columbia River. The present-day canyon was created when the Missoula Floods overtopped the northern drainage divide of the ancestral Palouse River, diverting it to the current course to the Snake River by eroding a new, deeper channel.^[7]^[10]

The area is characterized by interconnected and hanging flood-created coulees, cataracts, plunge pools, kolk created potholes, rock benches, buttes and pinnacles typical of scablands.^[9]

References

^ ^a ^b ^c "Palouse River". Geographic Names Information System. United States Geological Survey, United States Department of the Interior. 10 September 1979. Retrieved 2010-06-30.
^ ^a ^b Palouse Subbasin Plan Archived 2012-02-13 at the Wayback Machine, Northwest Power and Conservation Council
^ ^a ^b ^c "Water Resources Data, Water Year 2005; Snake River Basin including the Grande Ronde River, Asotin Creek, Tucannon River, and Palouse River Basins; 13351000 Palouse River at Hooper, WA" (PDF). United States Geological Survey. Retrieved 2009-06-02.
^ "USGS 13351000 Palouse River at Hooper, WA". USGS. Retrieved May 16, 2018.
^ "USGS 13351000 Palouse River at Hooper, WA". USGS. Retrieved May 16, 2018.
^ U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map, accessed May 3, 2011
^ ^a ^b Carson, Robert J.; Pogue, Kevin R. (1996). Flood Basalts and Glacier Floods:Roadside Geology of Parts of Walla Walla, Franklin, and Columbia Counties, Washington. Washington State Department of Natural Resources (Washington Division of Geology and Earth Resources Information Circular 90). ISBN none.
^ Alt, David (2001). Glacial Lake Missoula & its Humongous Floods. Mountain Press Publishing Company. ISBN 0-87842-415-6.
^ ^a ^b Bjornstad, Bruce (2006). On the Trail of the Ice Age Floods: A Geological Guide to the Mid-Columbia Basin. Keokee Books; Sandpoint, Idaho. ISBN 978-1-879628-27-4.
^ Alt, David & Hyndman, Donald (1984). Roadside Geology of Washington. Mountain Press Publishing Company. ISBN 0-87842-160-2.