Lakes / Montana / Bighorn Lake
Bighorn Lake, Big Horn County, Montana
12,422.5 acres
Surface Area
About 440 ft
Max Depth (Approximate)
3,302.96 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Montana
45.02 degrees N, 108.16 degrees W - Big Horn 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.
Depth Profile - Bighorn Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map. Max depth is approximate, from state bathymetry.
How Bighorn Lake Stacks Up
- Ranks #8 for surface area among the Montana lakes counted so far - 12,422.5 acres.
- The largest lake in Big Horn County among those counted.
- About 55 miles from Billings, as the crow flies.
- 31 fish species on the FWP list for this lake.
Fish Species
Black BullheadBlack CrappieBluegillBrook TroutBrown TroutBurbotChannel CatfishCommon CarpEmerald ShinerFathead MinnowFlathead ChubGreen SunfishLake ChubLargemouth BassLongnose DaceLongnose SuckerMountain WhitefishPlains MinnowPumpkinseedRainbow TroutRiver CarpsuckerSaugerShorthead RedhorseSmallmouth BassSpottail ShinerStonecatWalleyeWestern Silvery MinnowWhite CrappieWhite SuckerYellow Perch
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID120030832
CountyBig Horn
Coordinates45.0246, -108.1557
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: Montana Fish, Wildlife & Parks lake data (ID 120030832); Washington Dept. of Ecology bathymetry (approximate max depth). Verified October 30, 2026.