| Tieton Dam | |
| Dam Crosses: | Tieton River |
| Res Name: | Rimrock Lake |
| Location: | Yakima County, Washington, USA |
| Operator: | United States Bureau of Reclamation |
| Dam Length: | 920feet |
| Dam Height: | 319feet |
| Dam Volume: | 2049000ft3 |
| Opening: | 1925 |
| Res Capacity Total: | 203600sigfig=3NaNsigfig=3 |
| Res Capacity Active: | 198000acre ft |
| Res Catchment: | 184sqmi |
| Res Surface: | 2674sigfig=3NaNsigfig=3 |
| Coordinates: | 46.6564°N -121.1294°W |
Tieton Dam is an earth and concrete type dam on the Tieton River in Yakima County, in the U.S. state of Washington. The dam began operation in 1925. Its reservoir, Rimrock Lake, has a total capacity of 203600acre ft with a normal operating capacity of 198000acre ft to provides water for agricultural irrigation.[1] This dam is a component of the Yakima Project. Tieton Dam also produces electricity for Burbank Water and Power and Glendale Water and Power, near Los Angeles. The Southern California Public Power Agency installed two 7 megawatt generators in a project started in 2010. The power is transmitted over the Pacific DC Intertie that runs from Celilo, Oregon to Sylmar, California.[2] [3] Upstream from the dam, the river is impounded by Clear Creek Dam, another element of the Yakima Project. About downstream from the dam, the Tieton River is tapped for the Tieton Main Canal.