Lakes / Montana / Thompson Falls Reservoir
Thompson Falls Reservoir, Montana
969 acres
Surface Area
2,597.76 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Montana
47.59 degrees N, 115.34 degrees W - Sanders 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.
How Thompson Falls Reservoir Stacks Up
- About 63 miles from Kalispell, as the crow flies.
- 19 fish species on the FWP list for this lake.
Fish Species
Black BullheadBrown TroutBull TroutKokaneeLake TroutLargemouth BassLargescale SuckerLongnose DaceLongnose SuckerMountain WhitefishNorthern PikeNorthern Pike MinnowPeamouthPumpkinseedRainbow TroutRedside ShinerSmallmouth BassWestslope Cutthroat TroutYellow Perch
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID60955557
CountySanders
Coordinates47.5907, -115.3384
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 60955557). Verified October 30, 2026.