Aaron Lake vs Moses Lake
Water quality, depth, fish species, and recreation comparison.
Moses Lake has a higher water quality grade (A, Excellent) than Aaron Lake (C, Fair). Both are in Douglas County, Minnesota.
Aaron Lake and Moses Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. The grades are meaningfully apart: Moses Lake grades a A while Aaron Lake grades a C. 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 — Moses 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?
Aaron Lake
Moderate clarity, visible to about 7 ft.
Moses Lake
Crystal clear, you can see 16.2 ft down.
Side-by-Side Metrics
| Metric | Aaron Lake | Moses Lake |
|---|---|---|
| Overall Grade | C (Fair) | A (Excellent) |
| Water Clarity | 7 ft | 16.2 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | - | - |
| Surface Area | 611 acres | 824 acres |
| Public Access | Unknown | Unknown |
| Fish Species | 1 | 1 |
| Trophic State | mesotrophic | oligotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Moses Lake wins on overall water quality with a Grade A versus Aaron Lake's Grade C. Water clarity: 16.2 ft vs 7 ft. For fishing diversity, Moses Lake also leads with 1 species.