Alamo Lake is a mesotrophic lake in La Paz County, Arizona. Water quality is graded C based on 1 sampling years through 2026. Compared to the 1 other monitored lakes in La Paz County, Alamo Lake ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Arizona DNR, last sampled 2026-03-25. Grade methodology: LakeGrade methodology.
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Swimming Safety
Generally safe for swimming, moderate water quality
Water Quality Grade: C, Fair
Good clarity, visible to about 13 ft. Phosphorus level: 41 µg/L. Trophic State Index: 49.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 13 ft | B |
| Phosphorus | 41 µg/L | C |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 49 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Alamo Lake
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Fishing Alamo Lake
Location
County Ranking
Ranked #1 of 2 lakes in La Paz County
Nearby Lakes in La Paz County
Explore Alamo Lake 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: 2026-03-25
Monitoring stations: 2