Island Lake vs Sand Hill Lake
Water quality, depth, fish species, and recreation comparison.
Sand Hill Lake reads lower on nutrients and algae than Island Lake. Both are in Minnesota.
Both Island Lake and Sand Hill 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. Sand Hill Lake reads materially cleaner than Island Lake on nutrients and algae. 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 gap in the readings is decisive: Sand Hill Lake has the lower nutrient and algae numbers. 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
Murky, only visible to about 4.5 ft.
Sand Hill Lake
Moderate clarity, visible to about 6.9 ft.
Side-by-Side Metrics
| Metric | Island Lake | Sand Hill Lake |
|---|---|---|
| Water Clarity | 4.5 ft | 6.9 ft Better |
| Phosphorus | 30 µg/L | 26 µg/L Better |
| Chlorophyll-a (Algae) | 34.3 µg/L | 6.8 µg/L Better |
| Maximum Depth | 43 ft Better | 17 ft |
| Surface Area | 616 acres | 479 acres |
| Public Access | Yes | Yes |
| Fish Species | 11 Better | 6 |
| Trophic State | eutrophic | 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.
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Compare Island Lake or Sand Hill Lake against a different lake.
Verdict
Sand Hill Lake reads lower on nutrients and algae than Island Lake. Water clarity: 6.9 ft vs 4.5 ft. For more fish-species variety, Island Lake edges ahead with 11 documented species.
Source: EPA National Aquatic Resource Surveys, 2026.