Agnes Lake vs Shell Lake
Water quality, depth, fish species, and recreation comparison.
Agnes Lake has a higher water quality grade (B, Good) than Shell Lake (F, Very Poor). Both are in St. Louis County, Minnesota.
Both Agnes Lake and Shell 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. Agnes Lake (B) is materially cleaner than Shell Lake (F). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider grade gap is decisive — Agnes 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?
Agnes Lake
Good clarity, visible to about 13.5 ft.
Shell Lake
Very murky, less than 3 ft of visibility.
Side-by-Side Metrics
| Metric | Agnes Lake | Shell Lake |
|---|---|---|
| Overall Grade | B (Good) | F (Very Poor) |
| Water Clarity | 13.5 ft | 3 ft |
| Phosphorus | No data | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 30 ft | 15 ft |
| Surface Area | 1.0K acres | 493.3 acres |
| Public Access | No | No |
| Fish Species | 1 | 1 |
| Trophic State | oligotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Agnes Lake wins on overall water quality with a Grade B versus Shell Lake's Grade F. Water clarity: 13.5 ft vs 3 ft. For fishing diversity, Agnes Lake also leads with 1 species.