Lakes / Montana / Chelsea Slough
Chelsea Slough, Montana
372.6 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Montana
48.12 degrees N, 105.33 degrees W - Roosevelt County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Montana Fish, Wildlife & Parks coordinates, not by eye. Schematic - not a survey map.
Facts and Figures
Waterbody ID145720953
CountyRoosevelt
Coordinates48.1197, -105.3312
Largest Lakes in Montana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Fort Peck Lake | Valley | 233,053 acres | - |
| 2 | Flathead Lake | Lake | 122,132 acres | About 380 ft |
| 3 | Canyon Ferry Lake | Broadwater | 32,773 acres | About 170 ft |
| 4 | Lake Koocanusa | Lincoln | 28,723 acres | - |
| 5 | Hungry Horse Reservoir | Flathead | 23,577 acres | - |
Sources: USGS NHD lake data (ID 145720953). Verified October 30, 2026.