Rimrock Lake

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Rimrock Lake
Location Yakima County, Washington, United States
Coordinates 46°39′23″N 121°07′46″W / 46.65639°N 121.12944°W / 46.65639; -121.12944Coordinates: 46°39′23″N 121°07′46″W / 46.65639°N 121.12944°W / 46.65639; -121.12944
Type reservoir
Primary inflows Tieton River
Primary outflows Tieton River
Catchment area 187 mi² (484 km²)
Basin countries United States
Max. length 6 mi (9.7 km)
Max. width 1 mi (1.6 km)
Water volume 0.0586 cu mi (0.244 km3)
Surface elevation 2926 ft (892 m)

Rimrock Lake is a lake along the course of the Tieton River, in Yakima County, Washington state, US.

The lake is used as a storage reservoir for the Yakima Project, an irrigation project run by the United States Bureau of Reclamation. An impoundment of the Tieton River, Rimrock Lake's capacity and discharge is controlled by Tieton Dam, a 319 foot (97 m) high structure built in 1925. Rimrock Lake's active capacity is 198,000 acre feet (244,000,000 m3).[1]

Upstream from the lake, the Tieton River is impounded by Clear Creek Dam, another element of the Yakima Project. About 8 miles (13 km) downstream from Rimrock Lake the Tieton River is tapped by the Tieton Diversion Dam, supplying water to the Tieton Main Canal. The canal supplies irrigation water to the Tieton Division of the Yakima Project, with excess and agricultural runoff draining into Ahtanum Creek, west of Yakima.[1]

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