Green Castle Lake vs Mariposa Lake
Water quality, depth, fish species, and recreation comparison.
Green Castle Lake and Mariposa Lake both received the same overall water quality grade of C (Fair). Both are in Wisconsin.
Both Green Castle Lake and Mariposa 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. The grades are close: Green Castle Lake (C) and Mariposa Lake (C) are within one letter of each other on the LakeGrade rubric. The per-parameter sub-grades below will show where the small differences actually live.
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 Castle Lake
Murky, only visible to about 4.6 ft.
Mariposa Lake
Murky, only visible to about 5.1 ft.
Side-by-Side Metrics
| Metric | Green Castle Lake | Mariposa Lake |
|---|---|---|
| Overall Grade | C (Fair) | C (Fair) |
| Water Clarity | 4.6 ft | 5.1 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | 6.9 µg/L | 8.9 µg/L |
| Maximum Depth | - | - |
| Surface Area | 17 acres | 18.7 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 0 | 0 |
| Trophic State | eutrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade C. The tiebreakers come down to clarity (Green Castle Lake: 4.6 ft, Mariposa Lake: 5.1 ft) and what you want from the lake. Green Castle Lake matches its peer on species count.