Little Turtle Lake vs Turtle Lake
Water quality, depth, fish species, and recreation comparison.
Turtle Lake reads lower on nutrients and algae than Little Turtle Lake. 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 differences in the readings here are about the lakes themselves, not the agencies sampling them. The readings are meaningfully apart: Turtle Lake carries clearly lower phosphorus and chlorophyll-a readings than Little Turtle Lake. A spread that wide reflects real underlying differences, in watershed inputs, depth profiles, or monitoring rigor.
For a recreational visitor, the wider gap in the readings is decisive: Turtle Lake has the lower nutrient and algae numbers. 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 |
|---|---|---|
| Water Clarity | 6.5 ft | 10.2 ft Better |
| Phosphorus | 23.5 µg/L | 15 µg/L Better |
| Chlorophyll-a (Algae) | 12 µg/L | 4.9 µg/L Better |
| Maximum Depth | 25 ft | 45 ft Better |
| Surface Area | 469 acres | 1,607 acres |
| Public Access | No | Yes |
| Fish Species | 15 | 16 Better |
| Trophic State | eutrophic | mesotrophic |
A green ✓ marks the better value for that metric (lower phosphorus / chlorophyll = cleaner; higher Secchi / depth / species count = better). Surface area and trophic state carry no tick — a bigger lake is not a better lake.
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Verdict
Turtle Lake reads lower on nutrients and algae than Little Turtle Lake. Water clarity: 10.2 ft vs 6.5 ft. For fishing diversity, Turtle Lake also leads with 16 species.
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Source: EPA National Aquatic Resource Surveys, 2026.