Mary Lake vs Mill Lake
Water quality, depth, fish species, and recreation comparison.
Mary Lake and Mill Lake both received the same overall water quality grade of B (Good). Both are in Douglas County, Minnesota.
B
Mary Lake
Douglas County, Minnesota
Moderate clarity, visible to about 9.8 ft.
B
Mill Lake
Douglas County, Minnesota
Good clarity, visible to about 11 ft.
Side-by-Side Metrics
| Metric | Mary Lake | Mill Lake |
|---|---|---|
| Overall Grade | B (Good) | B (Good) |
| Water Clarity | 9.8 ft | 11 ft |
| Phosphorus | 19 µg/L | 24 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 40 ft | 40 ft |
| Surface Area | 2.5K acres | 451.12 acres |
| Public Access | Yes | Yes |
| Fish Species | 17 | 15 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Both lakes earn the same Grade B. The tiebreakers come down to clarity (Mary Lake: 9.8 ft, Mill Lake: 11 ft) and what you want from the lake. Mary Lake supports more documented fish species.