Catamount Lake Top
Routt County, ColoradoView mapDirections
Colorado WQCD publishes the water-quality measurements for Catamount Lake Top. Here is what has been measured.
- Impaired · Mercury
- Limited data
Catamount Lake Top in Routt County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Phosphorus: 46 µg/L.
Catamount Lake Top is a lake in Routt County, Colorado. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2020-08-18. Methodology: how these readings are compared.
Swimming conditions
No readingLimited data
Nutrient and algae readings are not a swimming clearance. Catamount Lake Top is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
Whether Catamount Lake Top is safe to swim in today is a call for the Water Quality Control Division of the Colorado Department of Public Health and Environment and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Catamount Lake Top
These are the measurements Colorado WQCD publishes for Catamount Lake Top, 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 46 µg/L. TSI 59.
| 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 | 46µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | No reading 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. | 59 | Eutrophic OligotrophicMesotrophicEutrophicHypereutrophic |
High nutrients, frequent algae, reduced clarity
Ask about Catamount Lake Top
Answers come straight from the public measurements and survey records on this page.
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Fishing Catamount Lake Top
Water quality readings over time
2 seasons of samples on record (2020–2021). Calling a direction takes at least 4 years of the same measurement.
Phosphorus
Worsening+26.5 µg/L/yr2 years
EPA Impairment Status
Catamount Lake Top is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
Designated uses not supporting: Aquatic life.
Source: EPA ATTAINS assessment unit COUCYA22_B · Official waterbody report
Nearby Lakes in Routt County
Frequently asked questions about Catamount Lake Top
Where is Catamount Lake Top?
- Catamount Lake Top is a lake in Routt County, Colorado. Its water-quality measurements are published by Colorado WQCD and shown on this page as reported.
What is the water quality of Catamount Lake Top?
- Catamount Lake Top in Routt County, Colorado has water-quality measurements published by Colorado WQCD, shown here as reported. Phosphorus: 46 µg/L.
Is Catamount Lake Top safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Catamount Lake Top is listed impaired under Clean Water Act §303(d) (IR 5) for mercury. Check local advisories before you swim.
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Where this data comes from
2 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado Dept. of Public Health & Environment-WQCD
21COL001_WQX2 samples · 2020
Analytical methods
- Phosphorus by Colorimetry
- Nitrogen in Water by Pyrolysis Detection
Monitoring station identifiers (1)
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.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database