Is Otrey Lake Safe for Swimming?
Otrey Lake in Big Stone County, Minnesota is not rated for water quality — its monitoring record does not meet the evidence bar. Not rated for swimming — there is not enough monitoring data to judge this lake. Water clarity: 1 ft visibility. Phosphorus: 431 µg/L. Chlorophyll-a (algae): 156 µg/L. Always check local health department advisories before swimming.
Key Metrics
| Metric | Value |
|---|---|
| Overall Grade | NR (Not rated) |
| Water Clarity (Secchi Depth) | 1 ft |
| Phosphorus | 431 μg/L |
| Chlorophyll-a (Algae) | 156 μg/L |
| Maximum Depth | 8 ft |
| Location | Big Stone County, Minnesota |
How does Otrey Lake compare?
Otrey Lake is not rated for water quality — its monitoring record does not meet the evidence bar, so it is not compared with the Minnesota state average.
Water clarity (Secchi depth) sits at 1 feet. That signals heavy algae or sediment, often tied to high phosphorus from runoff. Algae levels (chlorophyll-a) measure 156 µg/L — elevated; risk of harmful algal bloom advisories increases at this concentration.