Little Turtle Lake vs Turtle Lake
Water quality, depth, fish species, and recreation comparison.
Turtle Lake has a higher water quality grade (A, Excellent) than Little Turtle Lake (C, Fair). Both are in Beltrami County, Minnesota.
Both Little Turtle Lake and Turtle 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: Turtle Lake grades a A while Little Turtle 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 — Turtle 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?
Little Turtle Lake
Murky, only visible to about 6.5 ft.
Turtle Lake
Good clarity, visible to about 10.2 ft.
Side-by-Side Metrics
| Metric | Little Turtle Lake | Turtle Lake |
|---|---|---|
| Overall Grade | C (Fair) | A (Excellent) |
| Water Clarity | 6.5 ft | 10.2 ft |
| Phosphorus | 23.5 µg/L | 15 µg/L |
| Chlorophyll-a (Algae) | 12 µg/L | 4.9 µg/L |
| Maximum Depth | 25 ft | 45 ft |
| Surface Area | 469 acres | 1,607 acres |
| Public Access | No | Yes |
| Fish Species | 15 | 16 |
| Trophic State | eutrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Turtle Lake wins on overall water quality with a Grade A versus Little Turtle Lake's Grade C. Water clarity: 10.2 ft vs 6.5 ft. For fishing diversity, Turtle Lake also leads with 16 species.
Source: EPA National Aquatic Resource Surveys, 2026.