Usgs Lake is a cold, clear oligotrophic lake in Kootenai County, Idaho. Water quality is graded A based on 2 sampling years through 2012. Compared to the 6 other monitored lakes in Kootenai County, Usgs Lake ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, Idaho DNR, last sampled 2012-09-20. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
No clarity data. Phosphorus level: 4 µg/L. Chlorophyll-a: 1.6 µg/L. Trophic State Index: 30.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 4 µg/L | A |
| Chlorophyll-a (Algae) | 1.6 µg/L | A |
| Trophic State Index (TSI) | 30 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Usgs Lake
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Location
County Ranking
Ranked #2 of 7 lakes in Kootenai County
Nearby Lakes in Kootenai County
Explore Usgs Lake across LakeGrade
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Other Grade A Lakes in Idaho
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: 2012-09-20
Monitoring stations: 4