Lakes / Iowa / Mills County / Folsom Lake
Folsom Lake, Iowa
127 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Iowa
41.08 degrees N, 95.82 degrees W - Mills 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 Folsom Lake Stacks Up
- Larger than 60% of the 220 lakes counted in Iowa.
- The largest lake in Mills County among those counted.
- About 102 miles from Sioux City, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Pony Creek Lake | Mills | 1.7 mi | 84 acres |
| Keg Creek Lake | Mills | 6.9 mi | 55 acres |
| Lake Manawa | Pottawattamie | 8.6 mi | 733 acres |
| Forneys Lake | Fremont | 16 mi | 398 acres |
| Nobles Lake | Harrison | 30 mi | 31 acres |
| Horseshoe Lake | Harrison | 40 mi | 88 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Folsom Lake
How Big Is Folsom Lake?
Folsom Lake covers 127 acres in Mills County, Iowa.
What Is the Largest Lake in Mills County?
Folsom Lake is the largest lake in Mills County, at 127 acres.
Largest Lakes in Iowa
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Rathbun Lake | Appanoose | 13,869 acres | - |
| 2 | Lake Red Rock | Marion | 8,619 acres | - |
| 3 | Spirit Lake | Dickinson | 5,463 acres | - |
| 4 | Saylorville Lake | Polk | 5,428 acres | - |
| 5 | Clear Lake | Cerro Gordo | 3,632 acres | - |
All 220 Iowa lakes ranked by surface area
Sources: USGS NHD (The National Map NHD MapServer layer 12) named waterbodies FTYPE 390/436; counties via Census point-in-polygon lake data (ID 74256538). Verified October 30, 2026.