Is There a Cleaner Lake Near Willow Lake?
Compared against 6 graded lakes within 30 miles, in Iowa.
Willow Lake holds Grade B (Good). Of the 6 lakes within 30 miles of it that carry a grade, none scores higher on nutrients and algae, so Willow Lake is the cleanest graded water in that radius. Lakes nearby without enough recent sampling to earn a letter are not part of that comparison.
The graded lakes it was measured against
| Lake | County | Grade | Distance | Clarity |
|---|---|---|---|---|
| Willow Lake | Harrison County | B | This lake | 4.8 ft |
| Nelson Lake | Crawford County | F | 15.5 mi | 3.8 ft |
| Oldham Lake | Monona County | C | 16.5 mi | 5.1 ft |
| Manteno Lake | Shelby County | D | 17.5 mi | 2.7 ft |
| Desoto Bend Lake | Harrison County | F | 19.3 mi | 1 ft |
| Arrowhead Lake | Pottawattamie County | F | 25.2 mi | 1.8 ft |
| Blue Lake | Monona County | F | 26.9 mi | 0.9 ft |
What the comparison covers
A grade on LakeQuality comes from EPA Water Quality Portal samples: phosphorus, nitrogen, chlorophyll-a and turbidity, measured against EPA National Lakes Assessment ecoregion classes. Secchi clarity is shown and is not scored. This page compares Willow Lake only with neighbouring lakes in Iowathat carry a letter of their own, within 30 miles. A nearby lake with too little recent sampling has no letter to compare, so it is absent from the table rather than ranked below. Where a driving distance is not published for a lake, the table says so instead of estimating one.