Berkeley Lake
Denver County, ColoradoView mapDirections
Not enough samples to grade — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). No letter yet. Here is what we do have.
- Limited data
Berkeley Lake in Denver County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Phosphorus: 53 µg/L. Chlorophyll-a (algae): 34.1 µg/L.
- Clarity
- 1 ft
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Watch Berkeley Lake’s letter
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Why Berkeley Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Berkeley Lake, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded water clarity, phosphorus and algae (chlorophyll-a).
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by CDPHE and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Berkeley Lake is a lake in Denver County, Colorado.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2022-07-12. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Berkeley Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), oxygen depletion (low DO). Check local advisories before you swim.
Water quality measurements for Berkeley Lake
These readings exist but are not enough for an A–F grade — see why.
Very murky, less than 1 ft of visibility. Phosphorus 53 µg/L. Chlorophyll-a 34.1 µg/L. TSI 68.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1 ft | Not graded |
| Phosphorus | 53 µg/L | Not graded |
| Chlorophyll-a (Algae) | 34.1 µg/L | Not graded |
| Trophic State Index (TSI) | 68 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Berkeley Lake
EPA Impairment Status
Berkeley Lake 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 COSPUS17a_D · Official waterbody report
Graded lakes near Berkeley Lake
Berkeley Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Denver County
Frequently asked questions about Berkeley Lake
Where is Berkeley Lake?
- Berkeley Lake is a lake in Denver County, Colorado. LakeQuality has not rated this lake (UNRATED) — no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years).
What is the water quality grade for Berkeley Lake?
- Berkeley Lake in Denver County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 1 ft visibility. Phosphorus: 53 µg/L. Chlorophyll-a (algae): 34.1 µg/L.
Is Berkeley Lake safe to swim in?
- The letter is not a swimming clearance. Berkeley Lake is listed impaired under Clean Water Act §303(d) (IR 5) for mercury, metals (other than mercury), oxygen depletion (low DO). Check local advisories before you swim.
Explore Berkeley Lake across LakeQuality
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Where this data comes from
4 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Colorado Dept. of Public Health & Environment-WQCD
21COL001_WQX4 samples · 2022
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