Lake County, Colorado · Water Quality Report Card
Twin Lake West Lower
Twin Lake West Lower in Lake County, Colorado has a water quality grade of D (Poor). Phosphorus: 46 µg/L.
- Mean depth
- ~16 ft est.
- Type
- Eutrophic
Twin Lake West Lower is a productive, nutrient-rich eutrophic lake in Lake County, Colorado with an estimated average depth of about 16 feet. Water quality is graded D based on 2 sampling years through 2024. Compared to the 3 other monitored lakes in Lake County, Twin Lake West Lower ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2024-09-10. 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: 46 µg/L. Trophic State Index: 59.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 46 µg/L | Poor |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 59 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Lake Details
| Characteristic | Value |
|---|---|
| Average Depth | ~16 ft est. |
Depth marked “est.” is a modeled estimate from HydroLAKES, not a measured survey. Colorado has not published bathymetry for Twin Lake West Lower.
Where to stay near Twin Lake West Lower
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Fishing Twin Lake West Lower
Location
County Ranking
Ranked #4 of 4 lakes in Lake County
Nearby Lakes in Lake County
Explore Twin Lake West Lower 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
6 measurements from 1 monitoring station, 2024. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado Dept. of Public Health & Environment-WQCD
21COL001_WQX6 samples · 2024
Analytical methods
- Phosphorus by Colorimetry
- Nitrogen in Water by Pyrolysis Detection
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: 2024-09-10
Monitoring stations: 1