B
O'Brien Lake
Dakota County, Minnesota
Water Quality Grade: B — Good
Crystal clear — you can see 19.7 feet down. Phosphorus level: 21 µg/L. Chlorophyll-a: 5.7 µg/L.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6 m | A |
| Phosphorus | 21 µg/L | B |
| Chlorophyll-a (Algae) | 5.7 µg/L | B |
County Ranking
Ranked #3 of 43 lakes in Dakota County
Data Sources
Data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2023-09-27
Monitoring stations: 1