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Cooney Dam (National Inventory of Dams ID MT00001) is a dam in Carbon County, Montana, that creates Cooney Reservoir.
| Cooney Reservoir | |
|---|---|
  Cooney Reservoir | |
| Location | Carbon County, Montana |
| Coordinates | 45°26′38″N 109°13′19″W [1] |
| Lake type | Reservoir |
| Primary inflows | Red Lodge Creek, Willow Creek, Chapman Creek |
| Primary outflows | Red Lodge Creek |
| Basin countries | United States |
| Max. length | 2.3 miles (3.7 km) |
| Max. width | 1.1 miles (1.8 km) |
| Surface area | 1,078 acres (436 ha) |
| Water volume | 28,230 acre-feet (34,820,000 m3)[2] |
| Surface elevation | 4,222 feet (1,287 m)[1] |
The earthen dam was constructed in 1937 by the State of Montana, with a height of 97 feet (30 m), and a length of 2,260 feet (690 m) at its crest.[3] 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 (3.4 km2), a maximum storage capacity of 24,195 acre-feet (29,844,000 m3), and a normal capacity of 14,000 acre-feet (17,000,000 m3).[4] Recreation includes boating, camping, hiking, and fishing for walleye and rainbow trout.[5] The state maintains the adjacent Cooney State Park.[6]
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