Shell Lake vs Straight Lake
Water quality, depth, fish species, and recreation comparison.
Shell Lake reads lower on nutrients and algae than Straight Lake. Both are in Becker County, Minnesota.
Both Shell Lake and Straight 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. The readings are meaningfully apart: Shell Lake carries clearly lower phosphorus and chlorophyll-a readings than Straight Lake. A spread that wide reflects real underlying differences, in watershed inputs, depth profiles, or monitoring rigor.
For a recreational visitor, the wider gap in the readings is decisive: Shell 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?
Shell Lake
Moderate clarity, visible to about 7.3 ft.
Straight Lake
Moderate clarity, visible to about 8 ft.
Side-by-Side Metrics
| Metric | Shell Lake | Straight Lake |
|---|---|---|
| Water Clarity | 7.3 ft | 8 ft Better |
| Phosphorus | 21 µg/L | 14.5 µg/L Better |
| Chlorophyll-a (Algae) | 5 µg/L Better | 9.4 µg/L |
| Maximum Depth | 16 ft | 63 ft Better |
| Surface Area | 3,147 acres | 471 acres |
| Public Access | Yes | Yes |
| Fish Species | 14 | 15 Better |
| 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.
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Verdict
Shell Lake reads lower on nutrients and algae than Straight Lake. Water clarity: 7.3 ft vs 8 ft. For more fish-species variety, Straight Lake edges ahead with 15 documented species.
Source: EPA National Aquatic Resource Surveys, 2026.