Lakes / Montana / Upper Thompson Lake
Upper Thompson Lake, Montana
294 acres
Surface Area
About 100 ft
Max Depth (Approximate)
3,357 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Montana
48.06 degrees N, 115.12 degrees W - Lincoln 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 - Upper Thompson Lake
Schematic cross-section drawn to one shared depth scale - not a survey or bathymetric map. Max depth is approximate, from state bathymetry.
How Upper Thompson Lake Stacks Up
- About 38 miles from Kalispell, as the crow flies.
- 14 fish species on the FWP list for this lake.
Fish Species
Black CrappieBrook TroutKokaneeLargemouth BassLargescale SuckerLongnose SuckerNorthern PikeNorthern Pike MinnowPumpkinseedRainbow TroutRedside ShinerSmallmouth BassWestslope Cutthroat TroutYellow Perch
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID60959343
CountyLincoln
Coordinates48.0553, -115.1176
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 60959343); Washington Dept. of Ecology bathymetry (approximate max depth). Verified October 30, 2026.