Shell Lake vs Straight Lake
Water quality, depth, fish species, and recreation comparison.
Shell Lake has a higher water quality grade (A, Excellent) than Straight Lake (C, Fair). 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 grade differences here are about the lakes themselves, not the agencies grading them. The grades are meaningfully apart: Shell Lake grades a A while Straight Lake grades a C. That two-letter spread reflects real underlying differences — different watershed inputs, different depth profiles, or different monitoring rigor.
For a recreational visitor, the wider grade gap is decisive — Shell 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?
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 |
|---|---|---|
| Overall Grade | A (Excellent) | C (Fair) |
| Water Clarity | 7.3 ft | 8 ft |
| Phosphorus | 21 µg/L | 14.5 µg/L |
| Chlorophyll-a (Algae) | 5 µg/L | 9.4 µg/L |
| Maximum Depth | 16 ft | 63 ft |
| Surface Area | 3,147 acres | 471 acres |
| Public Access | Yes | Yes |
| Fish Species | 14 | 15 |
| Trophic State | mesotrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Shell Lake wins on overall water quality with a Grade A versus Straight Lake's Grade C. 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.