Lake Umatilla

Lake Umatilla
Lake Umatilla Location within Oregon Lake Umatilla Location within Washington (state) Lake Umatilla Location within the United States
Location	Oregon / Washington
Coordinates	45°43′3″N 120°41′38″W
Type	reservoir
Primary inflows	Columbia River
Primary outflows	Columbia River
Basin countries	United States
First flooded	1971 (1971)
Max. length	110 mi (177 km)
Surface elevation	266 ft (81 m)

Lake Umatilla is a 110-mile (177 km) long reservoir on the Columbia River in the United States, on the border of the U.S. states 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.

See also

• List of lakes in Washington (state)
• List of lakes in Oregon
• List of hydroelectric dams on the Columbia River