Lake Powell is a mesotrophic lake in Coconino County, Arizona. Water quality is graded C based on 1 sampling years through 2026. Compared to the 19 other monitored lakes in Coconino County, Lake Powell ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Arizona DNR, last sampled 2026-03-29. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Crystal clear, you can see 26.2 ft down. Phosphorus level: 32 µg/L. Trophic State Index: 42.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 26.2 ft | A |
| Phosphorus | 32 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 42 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Lake Powell
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Fishing Lake Powell
Location
County Ranking
Ranked #6 of 20 lakes in Coconino County
Nearby Lakes in Coconino County
Explore Lake Powell across LakeGrade
More Arizona Lake Rankings
Other Grade C Lakes in Arizona
Mesotrophic Lakes in Arizona
More records, surveys & data sources
Data Sources
Water quality data from the EPA Water Quality Portal
Grading methodology based on Metropolitan Council standards
Most recent sample: 2026-03-29
Monitoring stations: 1