D
Long Lake
Otter Tail County, Minnesota
Water Quality Grade: D — Poor
Very murky — less than 3.0 feet of visibility. Phosphorus level: 37.5 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.9 m | F |
| Phosphorus | 37.5 µg/L | C |
| Chlorophyll-a (Algae) | No data |
County Ranking
Ranked #100 of 109 lakes in Otter Tail County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2024-09-15
Monitoring stations: 1