Green Lake vs Lake Monongalia
Water quality, depth, fish species, and recreation comparison.
Green Lake has a higher water quality grade (A, Excellent) than Lake Monongalia (F, Very Poor). Both are in Kandiyohi County, Minnesota.
Both Green Lake and Lake Monongalia sit in Minnesota. 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. The grades are meaningfully apart: Green Lake grades a A while Lake Monongalia grades a F. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — Green Lake is the better water-quality choice. For a researcher, the gap is the interesting part: what is different about the two watersheds, and which of those differences is mutable?
Green Lake
Good clarity, visible to about 13.1 ft.
Lake Monongalia
Very murky, less than 3.3 ft of visibility.
Side-by-Side Metrics
| Metric | Green Lake | Lake Monongalia |
|---|---|---|
| Overall Grade | A (Excellent) | F (Very Poor) |
| Water Clarity | 13.1 ft | 3.3 ft |
| Phosphorus | 14 µg/L | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 110 ft | 14 ft |
| Surface Area | 5.6K acres | 2.3K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Green Lake wins on overall water quality with a Grade A versus Lake Monongalia's Grade F. Water clarity: 13.1 ft vs 3.3 ft. For fishing diversity, Green Lake also leads with 1 species.