Kolob Reservoir Midway is a cold, clear oligotrophic lake in Washington County, Utah. Water quality is graded B based on 2 sampling years through 2025. Compared to the 14 other monitored lakes in Washington County, Kolob Reservoir Midway ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2025-08-18. 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 9.5 ft. Chlorophyll-a: 1.5 µg/L. Trophic State Index: 40.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 9.5 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1.5 µg/L | A |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Kolob Reservoir Midway
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Fishing Kolob Reservoir Midway
Location
County Ranking
Ranked #7 of 15 lakes in Washington County
Cleaner Lakes Within 30 Miles
Kolob Reservoir Midway holds Grade B. 3 nearby lakes hold higher grades.
- AKolob ReservoirWashington County · 0.5 mi · Higher grade (B → A)
- ANla LakeKane County · 16.2 mi · Higher grade (B → A)
- AQuail Creek ReservoirWashington County · 25.8 mi · Higher grade (B → A)
Nearby Lakes in Washington County
Explore Kolob Reservoir Midway across LakeGrade
More Utah Lake Rankings
Other Grade B Lakes in Utah
Oligotrophic 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: 2025-08-18
Monitoring stations: 1