Lakes / Montana / Petroleum County
Lakes in Petroleum County, Montana
4 lakes counted in Petroleum County - the largest is Wild Horse Lake at 1,929.1 acres.
4
Lakes Counted
1,929.1 acres
Largest - Wild Horse Lake
Petroleum County, highlighted, with its largest counted lakes dotted. Outlines from Census boundary data.
All Counted Lakes
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Wild Horse Lake | Petroleum | 1,929.1 acres | - |
| 2 | Petrolia Lake | Petroleum | 518 acres | - |
| 3 | Yellow Water Reservoir | Petroleum | 442 acres | - |
| 4 | Little Bear Lake | Petroleum | 139.6 acres | - |
Sources: Montana Fish, Wildlife & Parks lake data; USGS. Verified October 30, 2026.