Lakes / Idaho / Custer County / Sullivan Lake
Sullivan Lake, Idaho
40.53 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Idaho
44.22 degrees N, 114.44 degrees W - Custer County. State and county outlines drawn from Census boundary data; the lake marker is placed by its USGS National Hydrography Dataset coordinates, not by eye. Schematic - not a survey map.
How Sullivan Lake Stacks Up
- Larger than 25% of the 316 lakes counted in Idaho.
- About 38 miles from Ketchum, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Jimmy Smith Lake | Custer | 4.1 mi | 62.76 acres |
| Quiet Lake | Custer | 14 mi | 27.43 acres |
| Champion Lakes | Custer | 19 mi | 39.42 acres |
| Mosquito Flat Reservoir | Custer | 20 mi | 49.13 acres |
| Little Redfish Lake | Custer | 23 mi | 63.77 acres |
| Redfish Lake | Custer | 25 mi | 1,503.88 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Sullivan Lake
How Big Is Sullivan Lake?
Sullivan Lake covers 40.53 acres in Custer County, Idaho.
What Is the Largest Lake in Custer County?
Redfish Lake is the largest lake in Custer County, at 1,503.88 acres.
Largest Lakes in Idaho
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Pend Oreille | Bonner | 92,764.44 acres | - |
| 2 | American Falls Reservoir | Power | 55,319.78 acres | - |
| 3 | Coeur d'Alene Lake | Kootenai | 26,891.64 acres | - |
| 4 | Lake Cascade | Valley | 25,043.4 acres | - |
| 5 | Priest Lake | Bonner | 23,425.59 acres | - |
All 316 Idaho lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 39264056). Verified October 30, 2026.