Lakes / South Dakota / Dewey County / Isabel Lake
Isabel Lake, South Dakota
107.99 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.44 degrees N, 101.42 degrees W - Dewey 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 Isabel Lake Stacks Up
- Larger than 45% of the 533 lakes counted in South Dakota.
- About 90 miles from Pierre, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Peach Lake | Dewey | 11 mi | 54.36 acres |
| Livermant Lake | Dewey | 11 mi | 64.49 acres |
| Horseshoe Lake | Dewey | 12 mi | 81.79 acres |
| Little Moreau Lake | Dewey | 17 mi | 33.85 acres |
| Timber Lake | Dewey | 17 mi | 424.08 acres |
| Dogeagle Lake | Corson | 22 mi | 139.61 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Isabel Lake
How Big Is Isabel Lake?
Isabel Lake covers 107.99 acres in Dewey County, South Dakota.
What Is the Largest Lake in Dewey County?
Lake Oahe is the largest lake in Dewey County, at 309,912.57 acres.
Largest Lakes in South Dakota
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Oahe | Dewey | 309,912.57 acres | - |
| 2 | Lake Francis Case | Charles Mix | 82,166.92 acres | - |
| 3 | Lake Sharpe | Hughes | 58,419.67 acres | - |
| 4 | Lewis and Clark Lake | Bon Homme | 25,141.99 acres | - |
| 5 | Lake Thompson | Kingsbury | 13,887.93 acres | - |
All 533 South Dakota lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID 143229800). Verified October 30, 2026.