Mann Creek Dam (National ID # ID00285) is a dam in Washington County, Idaho, in the western part of the state, a few miles north-northeast of the town of Weiser.
The earthen dam was an irrigation project of the United States Bureau of Reclamation. Completed in 1967, the dam impounds Mann Creek with a height of above bedrock, and a length of along its crest.[1] The dam is operated by the local Mann Creek Irrigation District.
Mann Creek Reservoir has a surface area of 283acres at an elevation of 880m (2,890feet). At closure it had a maximum capacity of but siltation reduced that number to by 1992.[2] The western side of the lake is the location of the former Mann Creek State Park. Boating and fishing are the main recreational activities.[3]