Lakes / Iowa / Monona County / Blue Lake
Blue Lake, Iowa
320 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Iowa
42.03 degrees N, 96.16 degrees W - Monona 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 Blue Lake Stacks Up
- Larger than 81% of the 220 lakes counted in Iowa.
- The largest lake in Monona County among those counted.
- About 34 miles from Sioux City, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Badger Lake | Monona | 7.9 mi | 62 acres |
| Badger Lake | Monona | 9.0 mi | 89 acres |
| Browns Lake | Woodbury | 21 mi | 248 acres |
| Horseshoe Lake | Harrison | 28 mi | 88 acres |
| Nobles Lake | Harrison | 38 mi | 31 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Blue Lake
How Big Is Blue Lake?
Blue Lake covers 320 acres in Monona County, Iowa.
What Is the Largest Lake in Monona County?
Blue Lake is the largest lake in Monona County, at 320 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 88307200). Verified October 30, 2026.