Lakes / Montana / Big Horn County
Lakes in Big Horn County, Montana
7 lakes counted in Big Horn County - the largest is Bighorn Lake at 12,422.5 acres.
7
Lakes Counted
12,422.5 acres
Largest - Bighorn Lake
Big Horn County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Bighorn Lake | Big Horn | 12,422.5 acres | About 440 ft |
| 2 | Tongue River Reservoir | Big Horn | 2,112 acres | - |
| 3 | Lodge Grass Storage Reservoir | Big Horn | 534 acres | - |
| 4 | Arapooish Pond | Big Horn | 29 acres | - |
| 5 | Halfway Reservoir | Big Horn | 14 acres | - |
| 6 | Rednose Reservoir | Big Horn | 12 acres | - |
| 7 | Brown Reservoir | Big Horn | 2 acres | - |
Sources: Montana Fish, Wildlife & Parks lake data; USGS. Verified October 30, 2026.