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| Lake Elwell | |
|---|---|
  Lake Elwell  Lake Elwell | |
| Location | Liberty / Toole counties, Montana, United States |
| Coordinates | 48°19′20″N 111°05′48″W / 48.32222°N 111.09667°W |
| Type | reservoir |
| Primary inflows | Marias River |
| Primary outflows | Marias River |
| Basin countries | United States |
| Surface area | 14,842 acres (60.06 km2) |
| Surface elevation | 3,025 ft (922 m) |
Lake Elwell (a.k.a. Tiber Reservoir) is a reservoir in north central Montana. The reservoir was created by the damming of the Marias River at the Tiber Dam. Lake Elwell was named for Judge Charles B. Elwell (1888–1974), former director of the Montana Reclamation Association.[1]