Miller Flat 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, Miller Flat Reservoir ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2025-09-23. 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 10.2 ft. Chlorophyll-a: 3.9 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 10.2 ft | B |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 3.9 µg/L | A |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Miller Flat Reservoir
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Fishing Miller Flat Reservoir
Location
County Ranking
Ranked #7 of 14 lakes in Emery County
Nearby Lakes in Emery County
Explore Miller Flat Reservoir across LakeGrade
More Utah Lake Rankings
Other Grade A Lakes in Utah
Sanpete County · Clarity: 11.3 ft
Sanpete County · Clarity: 14.5 ft
Sanpete County · Clarity: 19 ft
Wasatch County · Clarity: 16.4 ft
Wasatch County · Clarity: 22 ft
Wasatch County · Clarity: 17.1 ft
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: 2025-09-23
Monitoring stations: 1