Lakes / Montana / Fort Peck Lake
Fort Peck Lake, Valley County, Montana
233,053 acres
Surface Area
2,250 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Montana
47.76 degrees N, 106.86 degrees W - Valley 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 Fort Peck Lake Stacks Up
- The largest lake counted in Montana by surface area - 233,053 acres.
- The largest lake in Valley County among those counted.
- About 157 miles from Billings, as the crow flies.
- 49 fish species on the FWP list for this lake.
Fish Species
Bigmouth BuffaloBlack BullheadBlack CrappieBlue SuckerBluegillBrassy MinnowBrook SticklebackBrown TroutBurbotChannel CatfishChinook SalmonCiscoCommon CarpCreek ChubEmerald ShinerFathead MinnowFlathead ChubFreshwater DrumGoldeyeGreen SunfishIowa DarterLake ChubLake TroutLake WhitefishLargemouth BassLongnose DaceLongnose SuckerNorthern PikeNorthern Redbelly DacePaddlefishPallid SturgeonPlains KillifishPlains MinnowRainbow TroutRiver CarpsuckerSand ShinerSaugerSauger X Walleye HybridShorthead RedhorseShovelnose SturgeonSmallmouth BassSmallmouth BuffaloSpottail ShinerStonecatWalleyeWestern Silvery/Plains MinnowWhite CrappieWhite SuckerYellow Perch
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID151162999
CountyValley
Coordinates47.7553, -106.8628
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 151162999). Verified October 30, 2026.