Lakes / Montana / Flathead Lake
Flathead Lake, Montana
122,132 acres
Surface Area
About 380 ft
Max Depth (Approximate)
2,896 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Montana
47.89 degrees N, 114.13 degrees W - Lake 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 - Flathead Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map. Max depth is approximate, from state bathymetry.
How Flathead Lake Stacks Up
- Ranks #2 for surface area among the Montana lakes counted so far - 122,132 acres.
- The largest lake in Lake County among those counted.
- About 23 miles from Kalispell, as the crow flies.
- 21 fish species on the FWP list for this lake.
Fish Species
Black BullheadBlack CrappieBrook SticklebackBrook TroutBull TroutLake TroutLake WhitefishLargemouth BassLargescale SuckerLongnose SuckerMountain WhitefishNorthern PikeNorthern Pike MinnowPeamouthPumpkinseedPygmy WhitefishRainbow TroutRedside ShinerSmallmouth BassWestslope Cutthroat TroutYellow Perch
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID60787405
CountyLake
Coordinates47.8869, -114.1317
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 60787405); Washington Dept. of Ecology bathymetry (approximate max depth). Verified October 30, 2026.