Island Lake vs Shell Lake
Water quality, depth, fish species, and recreation comparison.
Island Lake and Shell Lake read the same on nutrients and algae. Both are in Becker County, Minnesota.
Both Island Lake and Shell Lake sit in Minnesota. A same-state comparison strips out the state-level water-quality regime as a variable: any differences in the readings here are about the lakes themselves, not the agencies sampling them. These two sit close on the readings, Island Lake versus Shell Lake. The deciding factors for a recreational visitor are likely physical (depth, access, fish species) rather than water-quality differences.
With readings this close, the choice between the two lakes turns on non-water-quality factors: depth, fish species, public access, distance from home. The per-lake pages below cover all of those.
Island Lake
Crystal clear, you can see 15 ft down.
Shell Lake
Moderate clarity, visible to about 7.3 ft.
Side-by-Side Metrics
| Metric | Island Lake | Shell Lake |
|---|---|---|
| Water Clarity | 15 ft Better | 7.3 ft |
| Phosphorus | 19 µg/L Better | 21 µg/L |
| Chlorophyll-a (Algae) | 3.2 µg/L Better | 5 µg/L |
| Maximum Depth | 38 ft Better | 16 ft |
| Surface Area | 1,179 acres | 3,147 acres |
| Public Access | Yes | Yes |
| Fish Species | 15 Better | 14 |
| Trophic State | mesotrophic | mesotrophic |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
Swap a lake
Compare Island Lake or Shell Lake against a different lake.
Verdict
Both lakes earn the same Grade A. The tiebreakers come down to clarity (Island Lake: 15 ft, Shell Lake: 7.3 ft) and what you want from the lake. Island Lake supports more documented fish species.
Source: EPA National Aquatic Resource Surveys, 2026.