Routt County, Colorado · Water Quality Report Card
Catamount Reservoir
Catamount Reservoir in Routt County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 66 µg/L.
- Mean depth
- ~26 ft est.
- Type
- Eutrophic
- Trend
- ↓ Declining
Catamount Reservoir is a productive, nutrient-rich eutrophic lake in Routt County, Colorado with an estimated average depth of about 26 feet. Overall water quality is declining over recent sampling years.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2021-07-28. Grade methodology: LakeGrade methodology.
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Swimming Safety
Not rated for swimming — there is not enough monitoring data to judge this lake
Water Quality Grade: Not rated
No clarity data. Phosphorus level: 66 µg/L. Trophic State Index: 65.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 66 µg/L | |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 65 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~26 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Colorado has not published bathymetry for Catamount Reservoir.
Where to stay near Catamount Reservoir
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Fishing Catamount Reservoir
Water Quality Trend: ↓ Declining
Based on 2 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +26.5 µg/L/yr | 2 |
Location
Nearby Lakes in Routt County
Explore Catamount Reservoir across LakeGrade
9.1 mi away · 283 ft
Species activity outlook by water temperature and season
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High nutrients, frequent algae, reduced clarity
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Lake Size & Watershed
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
Where this data comes from
2 measurements from 1 monitoring station, 2021. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado State University Agricultural Water Quality Program (Volunteer)
CSU_AWQP2 samples · 2021
Analytical methods
- 4500 P E ~ Phosphorus in Water by Colorimetry- Ascorbic Acid Method
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Lake size & watershed from HydroLAKES (HydroSHEDS)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2021-07-28
Monitoring stations: 1