The ecoregion includes the mainstem Columbia north of the Snake River and tributaries such as the Yakima, Okanagan, Pend Oreille, Clark Fork, and Kootenay Rivers.

The four largest that empty directly into the Columbia ( measured either by discharge or by size of watershed ) are the Snake River ( mostly in Idaho ), the Willamette River ( in northwest Oregon ), the Kootenay River ( mostly in British Columbia ), and the Pend Oreille River ( mostly in northern Washington and Idaho, also known as the lower part of the Clark Fork ).

The Pend Oreille river system ( including its main tributaries, the Clark Fork and Flathead rivers ) is also similar in size to the Columbia at their confluence.

Pend Oreille mine, Pend Oreille County, Washington.

* Pend Oreille County, Washington-east

* Little Pend Oreille National Wildlife Refuge ( part )

Pend Oreille County ( ) is a county located in the U. S. state of Washington.

Pend Oreille County was created out of Stevens County on March 1, 1911.

* Little Pend Oreille National Wildlife Refuge ( part )

Pend Oreille County Historical Museum, Newport, Washington | Newport.

* National Register of Historic Places listings in Pend Oreille County, Washington

de: Pend Oreille County

es: Condado de Pend Oreille

eo: Kantono Pend Oreille ( Vaŝingtonio )

fr: Comté de Pend Oreille

it: Contea di Pend Oreille

nl: Pend Oreille County

no: Pend Oreille County

nds: Pend Oreille County

pl: Hrabstwo Pend Oreille

pt: Condado de Pend Oreille

ro: Comitatul Pend Oreille, Washington

* http :// www. pendoreilleco. org / cities / i_details. asp Pend Oreille County Ione webpage

The Salish and Pend d ' Oreille migrated in from the north and northwest, venturing south to the Jefferson River / Missouri Headwaters and eastward.

* Pend Orielle Basin Commission formed to oversee any issues relating to water quality and / or water quantity in Lake Pend Oreille, Pend Oreille River, Priest Lake and Priest River Basin

* Pend Orielle Basin Commission formed to oversee any issues relating to water quality and / or water quantity in Lake Pend Oreille, Pend Oreille River, Priest Lake and Priest River Basin

* Pend Orielle Basin Commission formed to oversee any issues relating to water quality and / or water quantity in Lake Pend Oreille, Pend Oreille River, Priest Lake and Priest River Basin

The Clark Fork flows through downtown, heading north towards St. Regis, Montana and ultimately emptying into Lake Pend Oreille near Cabinet, Idaho.

The lake was the result of an ice dam on the Clark Fork caused by the southern encroachment of a finger of the Cordilleran Ice Sheet into the Idaho Panhandle ( at the present day location of Clark Fork, Idaho at the east end of Lake Pend Oreille ).

The Pend Oreille River, which drains the lake to the Columbia, is sometimes included as part of the Clark Fork, giving it a total length of 479 mi ( 771 km ), with a drainage area of 25, 820 sq mi ( 66, 870 km² ).

Approximately 8 mi ( 13 km ) west of the Idaho-Montana state line, the river enters the eastern end of Lake Pend Oreille, near the town of Clark Fork.

The mouth of the Clark Fork on Lake Pend Oreille in Idaho

The periodic rupturing and rebuilding of the ice dam released the Missoula Floods, a series of catastrophic floods down the Clark Fork and Pend Oreille into the Columbia which sculptured many of the geographic features of eastern Washington and the Willamette Valley of Oregon.

The Pend Oreille River begins at Lake Pend Oreille in Bonner County, Idaho in the Idaho Panhandle, draining the lake from its western end near Sandpoint ( The Clark Fork River enters the lake from its eastern end ).

The river is sometimes considered as one with the Clark Fork, which is the primary river flowing into Lake Pend Oreille.

For example, in Stewart Holbrook's book The Columbia, he repeatedly refers to the Pend Oreille River as the Clark Fork.

If the lengths of the North Fork Flathead, main Flathead, Clark Fork and Pend Oreille are added together, the total is over stretching from the Rocky Mountains north of Glacier National Park to the Canada-U. S. border south of Montrose, British Columbia.

After numerous wars and treaties, much of the land in the Pend Oreille basin especially the upper Clark Fork area had been ceded to the settlers.

Some emigrants also settled along the Clark Fork, but there were similar problems because for most of its course, the Clark Fork, like the Pend Oreille, flows in a steep and narrow gorge.

Map showing dams in the Pend Oreille River watershed ( Clark Fork-Lake Pend Oreille-Pend Oreille system highlighted in blue )

Variant names, according to the USGS, include: Bitter Root River, Bitterroot River, Clark Fork, Clarke Fork, Clarkes Fork, Clarks Fork, Deer Lodge River, Hell Gate River, Missoula River, Pend d ' Oreille River, Silver Bow River, Clark's Fork, and Pend-d ' Oreille River.

The Coeur d ' Alene are a Native American people who lived in villages along the Coeur d ' Alene, St. Joe, Clark Fork and Spokane Rivers ; as well as sites on the shores of Lake Coeur d ' Alene, Lake Pend Oreille and Hayden Lake, in what is now northern Idaho, eastern Washington and western Montana.

The primary tribal range from roughly Plains, Montana, westward along the Clark Fork River, Lake Pend Oreille in Idaho, and the Pend Oreille River in Eastern Washington and into British Columbia was given the name Kaniksu by the Kalispel peoples.