Rainbow Lake is a highly nutrient-loaded hypereutrophic lake in Navajo County, Arizona. Water quality is graded D based on 1 sampling years through 2025. Compared to the 4 other monitored lakes in Navajo County, Rainbow Lake ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Arizona DNR, last sampled 2025-11-04. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Very murky, less than 1.1 ft of visibility. Phosphorus level: 64 µg/L. Trophic State Index: 70.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.1 ft | F |
| Phosphorus | 64 µg/L | D |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 70 | Hypereutrophic |
Very high nutrients, dense algae, poor clarity
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Fishing Rainbow Lake
Location
County Ranking
Ranked #4 of 5 lakes in Navajo County
Cleaner Lakes Within 30 Miles
Rainbow Lake holds Grade D. One nearby lake has a higher grade.
Nearby Lakes in Navajo County
Explore Rainbow Lake across LakeGrade
More Arizona Lake Rankings
Other Grade D 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: 2025-11-04
Monitoring stations: 1