Routt County, Colorado · Water Quality Report Card
Stagecoach Lake
Stagecoach Lake in Routt County, Colorado has a water quality grade of D (Poor). Phosphorus: 50 µg/L.
- Mean depth
- ~58 ft est.
- Type
- Eutrophic
- Trend
- ↓ Declining
Stagecoach Lake is a productive, nutrient-rich eutrophic lake in Routt County, Colorado with an estimated average depth of about 58 feet. Water quality is graded D based on 1 sampling years through 2024. Overall water quality is declining over recent sampling years. Compared to the 3 other monitored lakes in Routt County, Stagecoach Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2024-07-24. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D (Poor)
No clarity data. Phosphorus level: 50 µg/L. Trophic State Index: 61.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 50 µg/L | Poor |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 61 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~58 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Colorado has not published bathymetry for Stagecoach Lake.
Where to stay near Stagecoach Lake
Compare lakeside cabins, hotels, and vacation rentals near Stagecoach Lake in Routt County, Colorado — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
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Fishing Stagecoach Lake
Water Quality Trend: ↓ Declining
Based on 4 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↓ Declining | -33 m/yr | 2 |
| Phosphorus | ↑ Improving | -25 µg/L/yr | 4 |
| Chlorophyll-a | ↓ Declining | +15.2 µg/L/yr | 2 |
Location
County Ranking
Ranked #4 of 4 lakes in Routt County
Cleaner Lakes Within 30 Miles
Stagecoach Lake holds Grade D. One nearby lake has a higher grade.
See full comparison →Nearby Lakes in Routt County
Explore Stagecoach Lake across LakeGrade
More Colorado Lake Rankings
Other Grade D Lakes in Colorado
Eutrophic Lakes in Colorado
More records, surveys & data sources
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
29 measurements from 1 monitoring station, 2021–2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado State University Agricultural Water Quality Program (Volunteer)
CSU_AWQP29 samples · 2021–2024
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: 2024-07-24
Monitoring stations: 1