There are at least 4 named lakes and reservoirs in Treasure County, Montana.
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- Haines Reservoir, 46°14′21″N 107°05′15″W / 46.23917°N 107.08750°W / 46.23917; -107.08750 (Haines Reservoir), el. 2,923 feet (891 m)[1]
- Horton Reservoir, 46°16′21″N 107°34′06″W / 46.27250°N 107.56833°W / 46.27250; -107.56833 (Horton Reservoir), el. 3,094 feet (943 m)[2]
- Larsens Reservoir, 46°16′30″N 107°32′05″W / 46.27500°N 107.53472°W / 46.27500; -107.53472 (Larsens Reservoir), el. 3,018 feet (920 m)[3]
- Teds Reservoir, 46°15′12″N 107°30′40″W / 46.25333°N 107.51111°W / 46.25333; -107.51111 (Teds Reservoir), el. 2,946 feet (898 m)[4]