Bowstring Lake vs Sand Lake
Water quality, depth, fish species, and recreation comparison.
Sand Lake has a higher water quality grade (A, Excellent) than Bowstring Lake (C, Fair). Both are in Itasca County, Minnesota.
Both Bowstring Lake and Sand 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: Sand Lake grades a A while Bowstring 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 — Sand 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?
Bowstring Lake
Moderate clarity, visible to about 8 ft.
Sand Lake
Good clarity, visible to about 13.2 ft.
Side-by-Side Metrics
| Metric | Bowstring Lake | Sand Lake |
|---|---|---|
| Overall Grade | C (Fair) | A (Excellent) |
| Water Clarity | 8 ft | 13.2 ft |
| Phosphorus | 38.5 µg/L | 18 µg/L |
| Chlorophyll-a (Algae) | 12.5 µg/L | 3.1 µg/L |
| Maximum Depth | 32 ft | 60 ft |
| Surface Area | 9,528 acres | 715 acres |
| Public Access | Yes | Yes |
| Fish Species | 17 | 0 |
| Trophic State | eutrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Sand Lake wins on overall water quality with a Grade A versus Bowstring Lake's Grade C. Water clarity: 13.2 ft vs 8 ft. For more fish-species variety, Bowstring Lake edges ahead with 17 documented species.
Source: EPA National Aquatic Resource Surveys, 2026.