Lakes / Wyoming / Sublette County / Flat Lake
Flat Lake, Wyoming
10 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Wyoming
43.45 degrees N, 109.83 degrees W - Sublette 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 Flat Lake Stacks Up
- Larger than 8% of the 783 lakes counted in Wyoming.
- About 47 miles from Jackson, as the crow flies.
- 2 fish species on the WGFD list for this lake.
Fish Species
Species recorded for this lake. Presence only - no abundance ratings.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Grass Lake | Sublette | 0.4 mi | 9 acres |
| Horseshoe Lake | Sublette | 1.1 mi | 48 acres |
| Abosko Lake | Sublette | 1.1 mi | 9 acres |
| Dollar Lake | Sublette | 1.7 mi | 11 acres |
| Deep Lake | Sublette | 2.1 mi | 28 acres |
| Granite Lake | Sublette | 3.4 mi | 48 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Flat Lake
How Big Is Flat Lake?
Flat Lake covers 10 acres in Sublette County, Wyoming.
What Fish Are in Flat Lake?
The WGFD lists Brook Trout and Snake River Cutthroat for Flat Lake.
What Is the Largest Lake in Sublette County?
Fremont Lake is the largest lake in Sublette County, at 5,051.16 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 34332703). Verified October 30, 2026.