Lakes / Montana / Cottonwood Reservoir
Cottonwood Reservoir, Montana
239 acres
Surface Area
5,097.12 ft
Surface Elevation
Where It Sits, and How Deep It Goes
Locator - Montana
46.04 degrees N, 110.69 degrees W - Park 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 Cottonwood Reservoir Stacks Up
- The largest lake in Park County among those counted.
- About 30 miles from Bozeman, as the crow flies.
- 1 fish species on the FWP list for this lake.
Fish Species
Yellowstone Cutthroat Trout
Species recorded for this lake. Presence only - no abundance ratings.
Facts and Figures
Waterbody ID59152881
CountyPark
Coordinates46.0386, -110.6917
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 59152881). Verified October 30, 2026.