Green Valley Lake vs Nodaway Lake
Water quality, depth, fish species, and recreation comparison.
Nodaway Lake has a higher water quality grade (D, Poor) than Green Valley Lake (F, Very Poor). Both are in Wisconsin.
Both Green Valley Lake and Nodaway 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 Nodaway Lake (D). 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.
Nodaway Lake
Very murky, less than 2.8 ft of visibility.
Side-by-Side Metrics
| Metric | Green Valley Lake | Nodaway Lake |
|---|---|---|
| Overall Grade | F (Very Poor) | D (Poor) |
| Water Clarity | 1.5 ft | 2.8 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | 61.7 µg/L | 27.6 µg/L |
| Maximum Depth | - | - |
| Surface Area | 336 acres | 27 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | hypereutrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Nodaway Lake wins on overall water quality with a Grade D versus Green Valley Lake's Grade F. Water clarity: 2.8 ft vs 1.5 ft. For fishing diversity, Nodaway Lake also leads with 0 species.