Ball Mountain Dam (National ID # VT00001) is a dam in Jamaica, Windham County, Vermont, in the southeastern part of the state.
The earthen and gravel gravity dam was constructed between 1957 and 1961 by the United States Army Corps of Engineers, with a height of and a length of at its crest. It impounds the West River of Vermont for flood control. The dam is owned and operated by the Army Corps of Engineers. The Corps identified safety and seepage problems with the dam in 2009, and has assigned it a Dam Safety Action Class rating of DSAC II, or "Urgent".
The reservoir it creates, Ball Mountain Reservoir, has a normal water surface of , a maximum capacity of , and a normal capacity of . Recreation includes fishing (for stocked Atlantic salmon, smallmouth bass, and trout), camping at 111 campsites in nearby Winhall and Jamaica, and activities at the adjacent Jamaica State Park. The river between Ball Mountain Lake and downstream Townshend Lake (also operated by the Army Corps of Engineers) is used for white water boating during releases from the Ball Mountain Dam, usually occurring during one weekend in April and one weekend in September.
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