Shallow Lake vs Shoal Lake
Water quality, depth, fish species, and recreation comparison.
Shallow Lake has a higher water quality grade (A, Excellent) than Shoal Lake (C, Fair). Both are in Itasca County, Minnesota.
Both Shallow Lake and Shoal 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. Shallow Lake (A) is materially cleaner than Shoal Lake (C). 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 — Shallow 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?
Shallow Lake
Crystal clear, you can see 16.4 ft down.
Shoal Lake
Moderate clarity, visible to about 8 ft.
Side-by-Side Metrics
| Metric | Shallow Lake | Shoal Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 16.4 ft | 8 ft |
| Phosphorus | 9 µg/L | No data |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 85 ft | 7 ft |
| Surface Area | 538.95 acres | 675.85 acres |
| Public Access | Yes | No |
| Fish Species | 1 | 0 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Shallow Lake wins on overall water quality with a Grade A versus Shoal Lake's Grade C. Water clarity: 16.4 ft vs 8 ft. For fishing diversity, Shallow Lake also leads with 1 species.