Long Lake vs Three Island Lake
Water quality, depth, fish species, and recreation comparison.
Long Lake has a higher water quality grade (A, Excellent) than Three Island Lake (A, Excellent). Both are in Beltrami County, Minnesota.
A
Long Lake
Beltrami County, Minnesota
Crystal clear, you can see 20 ft down.
A
Three Island Lake
Beltrami County, Minnesota
Good clarity, visible to about 12 ft.
Side-by-Side Metrics
| Metric | Long Lake | Three Island Lake |
|---|---|---|
| Overall Grade | A (Excellent) | A (Excellent) |
| Water Clarity | 20 ft | 12 ft |
| Phosphorus | 7 µg/L | 17 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 87 ft | 25 ft |
| Surface Area | 411.95 acres | 729.49 acres |
| Public Access | No | Yes |
| Fish Species | 11 | 17 |
| Trophic State | oligotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Long Lake wins on overall water quality with a Grade A versus Three Island Lake's Grade A. Water clarity: 20 ft vs 12 ft. For more fish-species variety, Three Island Lake edges ahead with 17 documented species.