Seven Lakes
Jackson 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
Seven Lakes in Jackson County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 10.5 µg/L.
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Watch Seven Lakes’s letter
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Why Seven Lakes 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 Seven Lakes, no nutrient or algae measurement meets the evidence bar (at least 3 samples within 10 years). Sampling here has recorded phosphorus, but not water clarity 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.
Seven Lakes is a lake in Jackson County, Colorado.
Source: EPA Water Quality Portal sampling records, CDPHE, last sampled 2020-08-31. 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 Seven Lakes
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Phosphorus 10.5 µg/L. TSI 38.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 10.5 µg/L | Not graded |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Seven Lakes
Graded lakes near Seven Lakes
Seven Lakes has no grade, but these lakes within a short drive do.
Nearby Lakes in Jackson County
Frequently asked questions about Seven Lakes
Where is Seven Lakes?
- Seven Lakes is a lake in Jackson 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 Seven Lakes?
- Seven Lakes in Jackson County, Colorado is not rated for water quality — its monitoring record does not meet the evidence bar. Phosphorus: 10.5 µg/L.
Is Seven Lakes safe to swim in?
- The letter is not a swimming clearance. Check local advisories before you swim.
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Where this data comes from
2 measurements from 1 monitoring station, 2020. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- USGS Colorado Water Science Center
USGS-CO2 samples · 2020
Analytical methods
- P, wu, WCA, persulfate CF color
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.