Bighorn Lake is a productive, nutrient-rich eutrophic lake in Big Horn County, Montana. Water quality is graded C based on 2 sampling years through 2019. Compared to the 6 other monitored lakes in Big Horn County, Bighorn Lake ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2019-08-14. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swim with caution, moderate algae may be present
Water Quality Grade: C, Fair
No clarity data. Phosphorus level: 37 µg/L. Chlorophyll-a: 17.1 µg/L. Trophic State Index: 57.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 37 µg/L | C |
| Chlorophyll-a (Algae) | 17.1 µg/L | C |
| Trophic State Index (TSI) | 57 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Bighorn Lake
Location
County Ranking
Ranked #6 of 7 lakes in Big Horn County
Nearby Lakes in Big Horn County
Explore Bighorn Lake across LakeGrade
More Montana Lake Rankings
Other Grade C Lakes in Montana
Eutrophic Lakes in Montana
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2019-08-14
Monitoring stations: 16