Island Lake vs Toad Lake
Water quality, depth, fish species, and recreation comparison.
Island Lake has a higher water quality grade (A, Excellent) than Toad Lake (C, Fair). Both are in Becker County, Minnesota.
Both Island Lake and Toad 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. Island Lake (A) is materially cleaner than Toad 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 — Island 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?
Island Lake
Crystal clear, you can see 15 ft down.
Toad Lake
Moderate clarity, visible to about 7 ft.
Side-by-Side Metrics
| Metric | Island Lake | Toad Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 15 ft | 7 ft |
| Phosphorus | 19 µg/L | 27 µg/L |
| Chlorophyll-a (Algae) | 3.2 µg/L | 8 µg/L |
| Maximum Depth | 38 ft | 29 ft |
| Surface Area | 1,179 acres | 1,715 acres |
| Public Access | Yes | Yes |
| Fish Species | 15 | 15 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Island Lake wins on overall water quality with a Grade A versus Toad Lake's Grade C. Water clarity: 15 ft vs 7 ft. For fishing diversity, Island Lake also leads with 15 species.
Source: EPA National Aquatic Resource Surveys, 2026.