Lakes / South Dakota / Fall River County / Angostura Reservoir
Angostura Reservoir, South Dakota
4,752.71 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
43.31 degrees N, 103.43 degrees W - Fall River 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 Angostura Reservoir Stacks Up
- Larger than 97% of the 533 lakes counted in South Dakota.
- The largest lake in Fall River County among those counted.
- About 54 miles from Rapid City, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Cold Brook Reservoir | Fall River | 11 mi | 32.62 acres |
| Limestone Butte Reservoir | Fall River | 17 mi | 92.91 acres |
| Stockade Lake | Custer | 32 mi | 125.28 acres |
| Oglala Lake | Shannon | 37 mi | 549.32 acres |
| Sheridan Lake | Pennington | 46 mi | 382.77 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Angostura Reservoir
How Big Is Angostura Reservoir?
Angostura Reservoir covers 4,752.71 acres in Fall River County, South Dakota.
What Is the Largest Lake in Fall River County?
Angostura Reservoir is the largest lake in Fall River County, at 4,752.71 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 {54E12CCD-3789-4C2F-B36B-173D3BD012EE}). Verified October 30, 2026.