Joes Valley Reservoir is a mesotrophic lake in Emery County, Utah. Water quality is graded A based on 2 sampling years through 2025. Compared to the 13 other monitored lakes in Emery County, Joes Valley Reservoir ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2025-09-30. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Good clarity, visible to about 11.2 ft. Chlorophyll-a: 2.5 µg/L. Trophic State Index: 41.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 11.2 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 2.5 µg/L | A |
| Trophic State Index (TSI) | 41 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Joes Valley Reservoir
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Fishing Joes Valley Reservoir
Location
County Ranking
Ranked #6 of 14 lakes in Emery County
Nearby Lakes in Emery County
Explore Joes Valley Reservoir across LakeGrade
More Utah Lake Rankings
Other Grade A Lakes in Utah
Mesotrophic Lakes in Utah
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: 2025-09-30
Monitoring stations: 1