Third Dam Lake is a mesotrophic lake in Cache County, Utah. Water quality is graded B based on 2 sampling years through 2020. Compared to the 16 other monitored lakes in Cache County, Third Dam Lake ranks #12 for water quality.
Source: EPA Water Quality Portal sampling records, Utah DNR, last sampled 2020-09-22. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 4.3 ft. Chlorophyll-a: 1 µg/L. Trophic State Index: 43.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.3 ft | D |
| Phosphorus | No data | |
| Chlorophyll-a (Algae) | 1 µg/L | A |
| Trophic State Index (TSI) | 43 | Mesotrophic |
Moderate nutrients, good water quality
Where to stay near Third Dam Lake
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Fishing Third Dam Lake
Location
County Ranking
Ranked #12 of 17 lakes in Cache County
Cleaner Lakes Within 30 Miles
Third Dam Lake holds Grade B. 2 nearby lakes hold higher grades.
- ANla LakeCache County · 12.2 mi · Higher grade (B → A)
- BHyrum ReservoirCache County · 11.6 mi · Higher overall water quality score
Nearby Lakes in Cache County
Explore Third Dam Lake across LakeGrade
More Utah Lake Rankings
Other Grade B Lakes in Utah
Rich County · Clarity: 11.8 ft
Weber County · Clarity: 11.9 ft
Rich County · Clarity: 11.5 ft
Rich County · Clarity: 9.8 ft
Box Elder County · Clarity: 6.5 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: 2020-09-22
Monitoring stations: 1