Bluff Lake
Denver County, ColoradoView mapDirections
Not Rated: one monitoring station are on record, but they measured water clarity only. LakeQuality’s A–F method grades total phosphorus, total nitrogen, chlorophyll-a, and turbidity; clarity is shown, not scored.
- Limited data
Bluff Lake in Denver County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.7 ft visibility.
- Clarity
- 4.7 ft
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Watch Bluff Lake’s letter
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Why Bluff Lake has no grade
Bluff Lake has monitoring on record from one station, but only water clarity was measured. LakeQuality’s A–F letter uses total phosphorus, total nitrogen, chlorophyll-a, and turbidity against EPA National Lakes Assessment condition classes. With none of those grading measurements on record, Bluff Lake is Not Rated — not an F. Its 4.7-foot median from 2 readings collected 2022 is still shown as clarity, but clarity alone cannot earn a letter.
Not Rated is EPA Integrated Reporting Category 3 — insufficient information. 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.
Bluff Lake is a lake in Denver County, Colorado.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2022-08-02. Grade methodology: LakeQuality methodology.
Swimming Safety
Not ratedLimited data
The letter is not a swimming clearance. Check local advisories before you swim.
Water quality measurements for Bluff Lake
These readings exist but are not enough for an A–F grade — see why.
Murky, only visible to about 4.7 ft. TSI 55.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.7 ft | Not graded |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Bluff Lake
Graded lakes near Bluff Lake
Bluff Lake has no grade, but these lakes within a short drive do.
Nearby Lakes in Denver County
Frequently asked questions about Bluff Lake
Where is Bluff Lake?
- Bluff 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 Bluff Lake?
- Bluff Lake in Denver County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Water clarity: 4.7 ft visibility.
Is Bluff Lake safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
Explore Bluff Lake across LakeQuality
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Where this data comes from
2 measurements from 1 monitoring station, 2022. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- North American Lake Management Society
NALMS2 samples · 2022
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.