Deer Lake vs North Turtle Lake
Water quality, depth, fish species, and recreation comparison.
Deer Lake has a higher water quality grade (B, Good) than North Turtle Lake (D, Poor). Both are in Otter Tail County, Minnesota.
Deer Lake and North Turtle Lake are both in Minnesota — a same-state head-to-head where the comparison comes down to lake-specific differences in depth, watershed, and monitoring history rather than the broader state-level water-quality regime. Deer Lake (B) is materially cleaner than North Turtle Lake (D). A gap that wide is unlikely to close in a single year of remediation work; it reflects multi-decade differences in the lakes themselves.
For a recreational visitor, the wider grade gap is decisive — Deer 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?
Deer Lake
Good clarity, visible to about 11.5 ft.
North Turtle Lake
Murky, only visible to about 3.8 ft.
Side-by-Side Metrics
| Metric | Deer Lake | North Turtle Lake |
|---|---|---|
| Overall Grade | B (Good) | D (Poor) |
| Water Clarity | 11.5 ft | 3.8 ft |
| Phosphorus | 21 µg/L | 63 µg/L |
| Chlorophyll-a (Algae) | No data | No data |
| Maximum Depth | 26 ft | 19 ft |
| Surface Area | 447.07 acres | 1.8K acres |
| Public Access | Yes | Yes |
| Fish Species | 1 | 1 |
| Trophic State | mesotrophic | eutrophic |
Bold value = better for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better).
Verdict
Deer Lake wins on overall water quality with a Grade B versus North Turtle Lake's Grade D. Water clarity: 11.5 ft vs 3.8 ft. For fishing diversity, Deer Lake also leads with 1 species.