Cooney Dam (National ID # MT00001) is a dam in Carbon County, Montana.
The earthen dam was constructed in 1937 by the State of Montana, with a height of 97 feet, and a length of 2260 feet at its crest. It impounds Red Lodge Creek for irrigation water storage. The dam is owned and operated by the Montana Department of Natural Resources and Conservation.
The reservoir it creates, Cooney Reservoir, has a normal water surface of 1.3 square miles, a maximum storage capacity of 24,195 acre-feet, and a normal capacity of 14,000 acre-feet. Recreation includes boating, camping, hiking, and fishing (for walleye and rainbow trout). The state maintains the adjacent Cooney State Park.