Millsite 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, Millsite Reservoir ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2025-10-01. Grade methodology: LakeGrade methodology.
Watch Millsite Reservoir water quality
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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 10.5 ft. Chlorophyll-a: 1.9 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.5 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1.9 µg/L | A |
| Trophic State Index (TSI) | 40 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Millsite Reservoir
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Fishing Millsite Reservoir
Location
County Ranking
Ranked #3 of 14 lakes in Emery County
Nearby Lakes in Emery County
Explore Millsite 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: 2025-10-01
Monitoring stations: 1