Hyrum Reservoir is a mesotrophic lake in Cache County, Utah. Water quality is graded B based on 2 sampling years through 2021. Compared to the 16 other monitored lakes in Cache County, Hyrum Reservoir ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2021-09-15. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Moderate clarity, visible to about 6.9 ft. Chlorophyll-a: 2.1 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 6.9 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 2.1 µg/L | A |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Hyrum Reservoir
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Fishing Hyrum Reservoir
Location
County Ranking
Ranked #6 of 17 lakes in Cache County
Nearby Lakes in Cache County
Explore Hyrum Reservoir across LakeGrade
More Utah Lake Rankings
Other Grade B Lakes in Utah
Box Elder County · Clarity: 6.5 ft
Weber County · Clarity: 11.9 ft
Rich County · Clarity: 11.5 ft
Rich County · Clarity: 11.8 ft
Rich County · Clarity: 9.8 ft
Morgan County · Clarity: 9.2 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: 2021-09-15
Monitoring stations: 2