Twin Lakes West
Lake County, ColoradoView mapDirections
Nutrients and algae sit mid-range for this region.
↓ down from B at the last regrade
- Oligotrophic
- #2 of 4 in the county
- Limited data
Twin Lakes West in Lake County, Colorado has a water quality grade of C (Fair). Water clarity: 11.5 ft visibility. Phosphorus: 46 µg/L. Chlorophyll-a (algae): 0.7 µg/L.
- Clarity
- 11.5 ft
- Type
- Oligotrophic
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Watch Twin Lakes West’s letter
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Twin Lakes West is a cold, clear oligotrophic lake in Lake County, Colorado. Water quality is graded C based on 3 sampling years through 2024. Compared to the 3 other monitored lakes in Lake County, Twin Lakes West ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2024-09-10. Grade methodology: LakeQuality methodology.
What Twin Lakes West is good for
From access and monitoring records, not editorial picks.
- Clear water11.5 ft of visibility
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The C is nutrients and algae, not a swimming clearance. Twin Lakes West is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). Check local advisories before you swim.
Water Quality Grade: C (Fair)
Good clarity, visible to about 11.5 ft. Phosphorus 46 µg/L. Chlorophyll-a 0.7 µg/L. TSI 43. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.5 ft | Not graded |
| Phosphorus | 46 µg/L | Poor |
| Chlorophyll-a (Algae) | 0.7 µg/L | Good |
| Trophic State Index (TSI) | 43 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Twin Lakes West
EPA Impairment Status
Twin Lakes West is officially listed as impaired under Clean Water Act §303(d) in the 2024 EPA reporting cycle (IR category 5).
Causes of impairment
A Total Maximum Daily Load (TMDL) plan has been approved.
Source: EPA ATTAINS assessment unit COARUA30_B · Official waterbody report · Matched by proximity (0.23 km)
County Ranking
Ranked #2 of 4 lakes in Lake County
Nearby Lakes in Lake County
Frequently asked questions about Twin Lakes West
Where is Twin Lakes West?
- Twin Lakes West is a lake in Lake County, Colorado. LakeQuality grades it C for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Twin Lakes West?
- Twin Lakes West in Lake County, Colorado has a water quality grade of C (Fair). Water clarity: 11.5 ft visibility. Phosphorus: 46 µg/L. Chlorophyll-a (algae): 0.7 µg/L.
Is Twin Lakes West safe to swim in?
- The C is nutrients and algae, not a swimming clearance. Twin Lakes West is listed impaired under Clean Water Act §303(d) (IR 5) for metals (other than mercury). Check local advisories before you swim.
Explore Twin Lakes West across LakeQuality
2 thermal springs within 19.9 mi, nearest Rhodes Warm Spring
Species activity outlook by water temperature and season
Where to stay at Colorado's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
Colorado's cleanest and most-polluted lakes, ranked
More Colorado Lake Rankings
Other Grade C Lakes in Colorado
Oligotrophic Lakes in Colorado
Where this data comes from
12 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_WQX12 samples · 2024
Analytical methods
- Secchi disk depth measurement
- Phosphorus by Colorimetry
- 10200 H ~ Chlorophyll a-b-c Determination
- Nitrogen in Water by Pyrolysis Detection
Monitoring station identifiers (1)
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.
Other records on this page
Impairment status from EPA ATTAINS 303(d) database