Bass Lake vs Island Lake
Water quality, depth, fish species, and recreation comparison.
Bass Lake has a higher water quality grade (A, Excellent) than Island Lake (C, Fair). Both are in Mahnomen County, Minnesota.
Bass Lake and Island 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. Bass Lake (A) is materially cleaner than Island 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 — Bass 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?
Bass Lake
Good clarity, visible to about 13.1 ft.
Island Lake
Murky, only visible to about 6.4 ft.
Side-by-Side Metrics
| Metric | Bass Lake | Island Lake |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 13.1 ft | 6.4 ft |
| Phosphorus | 10 µg/L | 30 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 26 ft | 43 ft |
| Surface Area | 734.97 acres | 616.07 acres |
| Public Access | Yes | Yes |
| 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
Bass Lake wins on overall water quality with a Grade A versus Island Lake's Grade C. Water clarity: 13.1 ft vs 6.4 ft. For fishing diversity, Bass Lake also leads with 1 species.