Dark Canyon Lake is a mesotrophic lake in San Juan County, Utah. Water quality is graded B based on 2 sampling years through 2025. Compared to the 17 other monitored lakes in San Juan County, Dark Canyon Lake ranks #14 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2025-08-27. 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 7.2 ft. Chlorophyll-a: 2.3 µg/L. Trophic State Index: 44.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 7.2 ft | C |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 2.3 µg/L | A |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Dark Canyon Lake
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Fishing Dark Canyon Lake
Location
County Ranking
Ranked #14 of 18 lakes in San Juan County
Nearby Lakes in San Juan County
Explore Dark Canyon Lake across LakeGrade
More Utah Lake Rankings
Other Grade B 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: 2025-08-27
Monitoring stations: 1