Greenfield Lake vs Mormon Trail Lake
Water quality, depth, fish species, and recreation comparison.
Mormon Trail Lake has a higher water quality grade (C, Fair) than Greenfield Lake (F, Very Poor). Both are in Adair County, Wisconsin.
Both Greenfield Lake and Mormon Trail 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 meaningfully apart: Mormon Trail Lake grades a C while Greenfield Lake 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 — Mormon Trail 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?
Greenfield Lake
Very murky, less than 2.1 ft of visibility.
Mormon Trail Lake
Murky, only visible to about 6.2 ft.
Side-by-Side Metrics
| Metric | Greenfield Lake | Mormon Trail Lake |
|---|---|---|
| Overall Grade | F (Very Poor) | C (Fair) |
| Water Clarity | 2.1 ft | 6.2 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | 53.8 µg/L | 9.7 µg/L |
| Maximum Depth | - | - |
| Surface Area | 49.6 acres | 33 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
Mormon Trail Lake wins on overall water quality with a Grade C versus Greenfield Lake's Grade F. Water clarity: 6.2 ft vs 2.1 ft. For fishing diversity, Mormon Trail Lake also leads with 0 species.