Lake Mary is a highly nutrient-loaded hypereutrophic lake in Coconino County, Arizona. Water quality is graded F based on 1 sampling years through 2025. Compared to the 19 other monitored lakes in Coconino County, Lake Mary ranks #18 for water quality.
Source: EPA Water Quality Portal sampling records, Arizona DNR, last sampled 2025-11-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Avoid swimming, very poor water quality, potential algae toxins
Water Quality Grade: F, Very Poor
Very murky, less than 0.3 ft of visibility. Phosphorus level: 120 µg/L. Trophic State Index: 83.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 0.3 ft | F |
| Phosphorus | 120 µg/L | F |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 83 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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Fishing Lake Mary
Location
County Ranking
Ranked #18 of 20 lakes in Coconino County
Nearby Lakes in Coconino County
Explore Lake Mary across LakeGrade
More Arizona Lake Rankings
Other Grade F Lakes in Arizona
Hypereutrophic 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: 2025-11-01
Monitoring stations: 1