Usgs Lake
Kootenai County, IdahoView mapDirections
Idaho DEQ publishes the water-quality measurements for Usgs Lake. Here is what has been measured.
- Public access
- Limited data
Usgs Lake in Kootenai County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1.7 µg/L.
Usgs Lake is a lake in Kootenai County, Idaho. Limited fish-species data available. Public access is available.
Source: EPA Water Quality Portal sampling records, IDEQ, last sampled 2012-09-20. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Usgs Lake is safe to swim in today is a call for the Idaho Department of Environmental Quality and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Usgs Lake
These are the measurements Idaho DEQ publishes for Usgs Lake, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
No clarity data. Phosphorus 6.5 µg/L. Chlorophyll-a 1.7 µg/L. TSI 33.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | No reading How deep a black-and-white disk stays visible from the surface. Higher is clearer. | |
| Total phosphorus | 6.5µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 1.7µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
| Trophic state (TSI)Carlson's 0–100 index of how much algae a lake can support, from clarity, phosphorus and chlorophyll-a. | 33 | Oligotrophic OligotrophicMesotrophicEutrophicHypereutrophic |
Low nutrients, clear water. No reading is a swimming clearance.
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Fishing Usgs Lake
Nearby Lakes in Kootenai County
Frequently asked questions about Usgs Lake
Where is Usgs Lake?
- Usgs Lake is a lake in Kootenai County, Idaho. Its water-quality measurements are published by Idaho DEQ and shown on this page as reported.
What is the water quality of Usgs Lake?
- Usgs Lake in Kootenai County, Idaho has water-quality measurements published by Idaho DEQ, shown here as reported. Phosphorus: 6.5 µg/L. Chlorophyll-a (algae): 1.7 µg/L.
Is Usgs Lake safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Can I fish at Usgs Lake?
- Public access to Usgs Lake is listed as yes on the lake record. Seasons, size and bag limits, and whether you need a license are set by Idaho's fish and wildlife agency, so check its current regulations before you go.
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Where this data comes from
133 measurements from 4 monitoring stations, 2012. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Idaho Department Of Environmental Quality
IDEQ_CDAOFFICE_WQX133 samples · 2012
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
- 10200 H 3 ~ Chlorophyll a-b-c Determination by fluorometer
Monitoring station identifiers (4)
EPA condition classes from the National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See where the data comes from and data sources.