Lake Powell Off Cha Canyon
San Juan County, UtahView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Oligotrophic
- #7 of 10 in the county
Lake Powell Off Cha Canyon in San Juan County, Utah has a water quality grade of B (Good). Water clarity: 13.1 ft visibility. Phosphorus: 9.4 µg/L.
- Clarity
- 13.1 ft
- Type
- Oligotrophic
- Phosphorus
- 9.4 µg/L
- Trend
- → Stable
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Watch Lake Powell Off Cha Canyon’s letter
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Lake Powell Off Cha Canyon is a cold, clear oligotrophic lake in San Juan County, Utah. Water quality is graded B based on 1 sampling years through 2025. Water clarity is improving over recent sampling years. Compared to the 9 other monitored lakes in San Juan County, Lake Powell Off Cha Canyon ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DWQ, last sampled 2025-06-24. Grade methodology: LakeQuality methodology.
What Lake Powell Off Cha Canyon is good for
From access and monitoring records, not editorial picks.
- Clear water13.1 ft of visibility
Swimming Safety
Grade onlyLow algae
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 B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
Good clarity, visible to about 13.1 ft. Phosphorus 9.4 µg/L. TSI 38. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13.1 ft | Not graded |
| Phosphorus | 9.4 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 38 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Lake Powell Off Cha Canyon
Water Quality Trend: → Stable
Based on 8 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.119 m/yr | 8 |
| Phosphorus | ↓ Declining | +1.02 µg/L/yr | 5 |
County Ranking
Ranked #7 of 10 lakes in San Juan County
Nearby Lakes in San Juan County
Frequently asked questions about Lake Powell Off Cha Canyon
Where is Lake Powell Off Cha Canyon?
- Lake Powell Off Cha Canyon is a lake in San Juan County, Utah. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Lake Powell Off Cha Canyon?
- Lake Powell Off Cha Canyon in San Juan County, Utah has a water quality grade of B (Good). Water clarity: 13.1 ft visibility. Phosphorus: 9.4 µg/L.
Is Lake Powell Off Cha Canyon safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Lake Powell Off Cha Canyon across LakeQuality
Species activity outlook by water temperature and season
Where to stay at Utah's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
Utah's cleanest and most-polluted lakes, ranked
More Utah Lake Rankings
Other Grade B Lakes in Utah
Oligotrophic Lakes in Utah
Where this data comes from
228 measurements from 1 monitoring station, 2012–2025. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- Utah Department Of Environmental Quality
UTAHDWQ_WQX228 samples · 2012–2025
Analytical methods
- Field Measurements
- Phosphorus by Colorimetry
- Turbidiy determined in the field
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.