Lakes / South Dakota / Brown County / Alkali Lake
Alkali Lake, Brown County, South Dakota
85.75 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - South Dakota
45.54 degrees N, 98.48 degrees W - Brown 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 Alkali Lake Stacks Up
- Larger than 35% of the 533 lakes counted in South Dakota.
- About 5 miles from Aberdeen, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Richmond Lake | Brown | 6.4 mi | 810.01 acres |
| Lords Lake | Brown | 12 mi | 89.45 acres |
| Willow Creek Lake | Brown | 13 mi | 255.51 acres |
| Lake Parmley | Edmunds | 14 mi | 696.84 acres |
| Columbia Road Reservoir | Brown | 16 mi | 7,074.89 acres |
| Crompton Lake | McPherson | 19 mi | 56.83 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Alkali Lake
How Big Is Alkali Lake?
Alkali Lake covers 85.75 acres in Brown County, South Dakota.
What Is the Largest Lake in Brown County?
Columbia Road Reservoir is the largest lake in Brown County, at 7,074.89 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 148621826). Verified October 30, 2026.