Lake Umatilla
Encyclopedia
Lake Umatilla is a 110 mi (177 km) long reservoir
on the Columbia River
in the United States
, between the U.S. state
s of Washington and Oregon
. It was created in 1971 with the construction of John Day Dam
, and stretches upstream to the McNary Dam
. It lies in parts of Sherman
, Gilliam
, Morrow
, and Umatilla
counties in Oregon, and Klickitat and Benton
counties in Washington.
Reservoir
A reservoir , artificial lake or dam is used to store water.Reservoirs may be created in river valleys by the construction of a dam or may be built by excavation in the ground or by conventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to...
on the Columbia River
Columbia River
The Columbia River is the largest river in the Pacific Northwest region of North America. The river rises in the Rocky Mountains of British Columbia, Canada, flows northwest and then south into the U.S. state of Washington, then turns west to form most of the border between Washington and the state...
in the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
, between the U.S. state
U.S. state
A U.S. state is any one of the 50 federated states of the United States of America that share sovereignty with the federal government. Because of this shared sovereignty, an American is a citizen both of the federal entity and of his or her state of domicile. Four states use the official title of...
s of Washington and Oregon
Oregon
Oregon is a state in the Pacific Northwest region of the United States. It is located on the Pacific coast, with Washington to the north, California to the south, Nevada on the southeast and Idaho to the east. The Columbia and Snake rivers delineate much of Oregon's northern and eastern...
. It was created in 1971 with the construction of John Day Dam
John Day Dam
The John Day Dam is a concrete gravity run-of-the-river dam spanning the Columbia River in the northwestern United States. The dam features a navigation lock plus fish ladders on both sides. The John Day Lock has the highest lift of any U.S. lock...
, and stretches upstream to the McNary Dam
McNary Dam
McNary Dam is a 1.4-mile long concrete gravity run-of-the-river dam which spans the Columbia River. It joins Umatilla County, Oregon with Benton County, Washington, 292 miles upriver from the mouth of the Columbia at Astoria, Oregon. It is operated by the U.S. Army Corps of Engineers' McNary...
. It lies in parts of Sherman
Sherman County, Oregon
Sherman County is a county located in the U.S. state of Oregon. The county is named for William Tecumseh Sherman, a Union general in the American Civil War. In 2010, its population was 1,765. The seat of the county is Moro. The largest city is Wasco....
, Gilliam
Gilliam County, Oregon
-Demographics:As of the census of 2000, there were 1,915 people, 819 households, and 543 families residing in the county. The population density was 2 people per square mile . There were 1,043 housing units at an average density of 1 per square mile...
, Morrow
Morrow County, Oregon
Morrow County is a county located in the U.S. state of Oregon, on the south side of the Columbia River. It is included in the 8 county definition of Eastern Oregon. The county is named for one of its first white settlers, Jackson L. Morrow, who was a member of the state legislature when the county...
, and Umatilla
Umatilla County, Oregon
Umatilla County is a county located in the U.S. state of Oregon. It is included in the 8 county definition of Eastern Oregon. The county is named for the Umatilla River. In 2010, its population was 75,889...
counties in Oregon, and Klickitat and Benton
Benton County, Washington
Benton County is a county located in the south-central portion of the U.S. state of Washington. The Columbia River makes up the north, south, and east boundaries of the county. In 2010, its population was 175,177. The county seat is Prosser, and its largest city is Kennewick...
counties in Washington.