Lakes / Wyoming / Sweetwater County / Brannan Reservoir
Brannan Reservoir, Wyoming
99.13 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Wyoming
42.16 degrees N, 108.51 degrees W - Sweetwater 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 Brannan Reservoir Stacks Up
- Larger than 72% of the 783 lakes counted in Wyoming.
- About 121 miles from Casper, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Buffalo Hump Lake | Sweetwater | 5.3 mi | 27.18 acres |
| Scotty Lake | Sweetwater | 7.2 mi | 72.38 acres |
| McKay Lake | Sweetwater | 8.2 mi | 71.1 acres |
| Picket Lake | Fremont | 8.3 mi | 263.55 acres |
| Circle Bar Lake | Fremont | 8.6 mi | 78.28 acres |
| Bush Lake | Sweetwater | 11 mi | 229.43 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Brannan Reservoir
How Big Is Brannan Reservoir?
Brannan Reservoir covers 99.13 acres in Sweetwater County, Wyoming.
What Is the Largest Lake in Sweetwater County?
Flaming Gorge Reservoir is the largest lake in Sweetwater County, at 38,888.36 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 136834115). Verified October 30, 2026.