Lakes / Wyoming / Park County / Ralston Reservoir
Ralston Reservoir, Wyoming
129 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Wyoming
44.71 degrees N, 108.89 degrees W - Park 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 Ralston Reservoir Stacks Up
- Larger than 79% of the 783 lakes counted in Wyoming.
- About 15 miles from Cody, as the crow flies.
- 1 fish species on the WGFD list for this lake.
Fish Species
Black Bullhead
Species recorded for this lake. Presence only - no abundance ratings.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Three Falls Reservoir | Park | 8.1 mi | 10 acres |
| Whistle Creek Reservoir | Park | 11 mi | 6 acres |
| Alkali Lake | Park | 16 mi | 103.54 acres |
| Beck Lake | Park | 16 mi | 108 acres |
| Newton Lakes | Park | 16 mi | 51 acres |
| Markham Reservoir | Park | 16 mi | 14 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Ralston Reservoir
How Big Is Ralston Reservoir?
Ralston Reservoir covers 129 acres in Park County, Wyoming.
What Fish Are in Ralston Reservoir?
The WGFD lists Black Bullhead for Ralston Reservoir.
What Is the Largest Lake in Park County?
Buffalo Bill Reservoir is the largest lake in Park County, at 6,691 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: Wyoming Game & Fish lake data (ID 65486771). Verified October 30, 2026.