Lakes / Wyoming / Crook County / Keyhole Reservoir
Keyhole Reservoir, Wyoming
8,862.41 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Wyoming
44.36 degrees N, 104.84 degrees W - Crook County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Wyoming Game and Fish Department coordinates, not by eye. Schematic - not a survey map.
How Keyhole Reservoir Stacks Up
- Ranks #9 for surface area among the Wyoming lakes counted so far - 8,862.41 acres.
- The largest lake in Crook County among those counted.
- About 128 miles from Casper, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Hagerman Reservoir | Crook | 14 mi | 37.07 acres |
| Arrowhead Reservoir | Crook | 16 mi | 38.05 acres |
| C B | Weston | 20 mi | 27.02 acres |
| Garner Lake | Campbell | 28 mi | 69.19 acres |
| Ditto Lake | Campbell | 29 mi | 71.17 acres |
| Rocky Ford Reservoir | Crook | 32 mi | 28.86 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Keyhole Reservoir
How Big Is Keyhole Reservoir?
Keyhole Reservoir covers 8,862.41 acres in Crook County, Wyoming.
What Is the Largest Lake in Crook County?
Keyhole Reservoir is the largest lake in Crook County, at 8,862.41 acres.
Deepest Natural Lakes in Wyoming
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Deep Lake | Park | 285 acres | 472 ft |
| 2 | Lake Reno | Park | 107 acres | 222 ft |
| 3 | Snowdrift Lake | Teton | 57 acres | 174 ft |
| 4 | Crater Lake | Big Horn | 39 acres | 166 ft |
| 5 | Beauty Lake | Park | 94 acres | 165 ft |
All 120 Wyoming lakes ranked by depth
Largest Lakes in Wyoming
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Yellowstone Lake | Teton | 84,442 acres | - |
| 2 | Flaming Gorge Reservoir | Sweetwater | 38,888.36 acres | 440 ft |
| 3 | Jackson Lake | Teton | 26,853.22 acres | - |
| 4 | Pathfinder Reservoir | Carbon | 22,000 acres | 192 ft |
| 5 | Seminoe Reservoir | Carbon | 20,000 acres | 200 ft |
All 783 Wyoming lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 140523605). Verified October 30, 2026.