North Turtle Lake vs South Turtle Lake
Water quality, depth, fish species, and recreation comparison.
South Turtle Lake has a higher water quality grade (B, Good) than North Turtle Lake (D, Poor). Both are in Otter Tail County, Minnesota.
Both North Turtle Lake and South 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: South Turtle Lake grades a B while North Turtle Lake grades a D. 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 — South 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?
North Turtle Lake
Murky, only visible to about 3.8 ft.
South Turtle Lake
Good clarity, visible to about 14.1 ft.
Side-by-Side Metrics
| Metric | North Turtle Lake | South Turtle Lake |
|---|---|---|
| Overall Grade | D (Poor) | B (Good) |
| Water Clarity | 3.8 ft | 14.1 ft |
| Phosphorus | 63 µg/L | 20 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 19 ft | 35 ft |
| Surface Area | 1.8K acres | 836.57 acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | eutrophic | mesotrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
South Turtle Lake wins on overall water quality with a Grade B versus North Turtle Lake's Grade D. Water clarity: 14.1 ft vs 3.8 ft. For fishing diversity, South Turtle Lake also leads with 1 species.