Swan Lake vs Wall Lake
Water quality, depth, fish species, and recreation comparison.
Swan Lake and Wall Lake both received the same overall water quality grade of A (Excellent). Both are in Otter Tail County, Minnesota.
Both Swan Lake and Wall Lake 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 close: Swan Lake (A) and Wall Lake (A) 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.
Swan Lake
Good clarity, visible to about 12.1 ft.
Wall Lake
Moderate clarity, visible to about 8.7 ft.
Side-by-Side Metrics
| Metric | Swan Lake | Wall Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 12.1 ft | 8.7 ft |
| Phosphorus | 18 µg/L | 21 µg/L |
| Chlorophyll-a (Algae) | 4 µg/L | 6.5 µg/L |
| Maximum Depth | 44 ft | 34 ft |
| Surface Area | 749 acres | 727 acres |
| Public Access | Yes | Yes |
| Fish Species | 16 | 19 |
| 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 A. The tiebreakers come down to clarity (Swan Lake: 12.1 ft, Wall Lake: 8.7 ft) and what you want from the lake. Swan Lake has fewer fish species than Wall Lake.
Source: EPA National Aquatic Resource Surveys, 2026.