| Lake Elwell | |
| Coords: | 48.3222°N -111.0967°W |
| Basin Countries: | United States |
| Area: | 14842acres |
| Elevation: | 3025feet |
| Pushpin Map: | Montana#USA |
| Pushpin Map Alt: | Location of Lake Elwell in Montana, USA. |
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]