Green Valley Lake vs Mckinley Lake
Water quality, depth, fish species, and recreation comparison.
Green Valley Lake and Mckinley Lake both received the same overall water quality grade of F (Very Poor). Both are in Union County, Wisconsin.
Both Green Valley Lake and Mckinley Lake sit in Iowa. A same-state comparison strips out the state-level water-quality regime as a variable: any grade differences here are about the lakes themselves, not the agencies grading them. These two are within a letter of each other on the rubric — Green Valley Lake (F) versus Mckinley Lake (F). The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
With grades this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Green Valley Lake
Very murky, less than 1.5 ft of visibility.
Mckinley Lake
Very murky, less than 1 ft of visibility.
Side-by-Side Metrics
| Metric | Green Valley Lake | Mckinley Lake |
|---|---|---|
| Overall Grade | F (Very Poor) | F (Very Poor) |
| Water Clarity | 1.5 ft | 1 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | 61.7 µg/L | 69.3 µg/L |
| Maximum Depth | - | - |
| Surface Area | 336 acres | 38 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | hypereutrophic | hypereutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade F. The tiebreakers come down to clarity (Green Valley Lake: 1.5 ft, Mckinley Lake: 1 ft) and what you want from the lake. Green Valley Lake matches its peer on species count.