Lakes / South Dakota / Pennington County / Deerfield Lake
Deerfield Lake, South Dakota
327.91 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
44.02 degrees N, 103.80 degrees W - Pennington 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 Deerfield Lake Stacks Up
- Larger than 75% of the 533 lakes counted in South Dakota.
- About 29 miles from Rapid City, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Pactola Reservoir | Pennington | 15 mi | 840.65 acres |
| Sheridan Lake | Pennington | 17 mi | 382.77 acres |
| Stockade Lake | Custer | 22 mi | 125.28 acres |
| Canyon Lake | Pennington | 25 mi | 38.45 acres |
| Bear Butte Lake | Meade | 35 mi | 199.41 acres |
| Cold Brook Reservoir | Fall River | 42 mi | 32.62 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Deerfield Lake
How Big Is Deerfield Lake?
Deerfield Lake covers 327.91 acres in Pennington County, South Dakota.
What Is the Largest Lake in Pennington County?
Pactola Reservoir is the largest lake in Pennington County, at 840.65 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 143987665). Verified October 30, 2026.