Lakes / Montana / Eureka Reservoir
Eureka Reservoir, Montana
366 acres
Surface Area
4,149.2 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Montana
47.88 degrees N, 112.31 degrees W - Teton 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 Eureka Reservoir Stacks Up
- About 55 miles from Great Falls, as the crow flies.
- 8 fish species on the FWP list for this lake.
Fish Species
Brook TroutBrown TroutLongnose SuckerNorthern Redbelly/Finescale DaceRainbow TroutRedbelly X Finescale DaceWestslope X RainbowWhite Sucker
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID129592847
CountyTeton
Coordinates47.8821, -112.3107
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 129592847). Verified October 30, 2026.