Alder Lake vs Watap Lake
Water quality, depth, fish species, and recreation comparison.
Alder Lake has a higher water quality grade (A, Excellent) than Watap Lake (C, Fair). Both are in Cook County, Minnesota.
Alder Lake and Watap 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: Alder Lake grades a A while Watap 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 — Alder 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?
Alder Lake
Good clarity, visible to about 13.8 ft.
Watap Lake
Moderate clarity, visible to about 9 ft.
Side-by-Side Metrics
| Metric | Alder Lake | Watap Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 13.8 ft | 9 ft |
| Phosphorus | 8 µg/L | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 72 ft | 210 ft |
| Surface Area | 528.93 acres | 2.0K acres |
| Public Access | No | No |
| Fish Species | 0 | 1 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Alder Lake wins on overall water quality with a Grade A versus Watap Lake's Grade C. Water clarity: 13.8 ft vs 9 ft. For more fish-species variety, Watap Lake edges ahead with 1 documented species.