Flathead Lake Unknown Culvert is a productive, nutrient-rich eutrophic lake in Lake County, Montana. Water quality is graded C based on 1 sampling years through 2021. Compared to the 26 other monitored lakes in Lake County, Flathead Lake Unknown Culvert ranks #27 for water quality.
Source: EPA Water Quality Portal sampling records, Montana DNR, last sampled 2021-06-02. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
No clarity data. Phosphorus level: 43 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 43 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Where to stay near Flathead Lake Unknown Culvert
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Fishing Flathead Lake Unknown Culvert
Location
County Ranking
Ranked #27 of 27 lakes in Lake County
Cleaner Lakes Within 30 Miles
Flathead Lake Unknown Culvert holds Grade C. 3 nearby lakes hold higher grades.
Nearby Lakes in Lake County
Explore Flathead Lake Unknown Culvert across LakeGrade
More Montana Lake Rankings
Other Grade C 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: 2021-06-02
Monitoring stations: 1