Carbon County, Wyoming · Water Quality Report Card
Hanna Reservoir
Hanna Reservoir in Carbon County, Wyoming has a water quality grade of B (Good). Phosphorus: 10 µg/L.
- Type
- Oligotrophic
Hanna Reservoir is a cold, clear oligotrophic lake in Carbon County, Wyoming. Water quality is graded B based on 1 sampling years through 2017. Compared to the 9 other monitored lakes in Carbon County, Hanna Reservoir ranks #6 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2017-09-18. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B (Good)
No clarity data. Phosphorus level: 10 µg/L. Trophic State Index: 37.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No data | |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | No data | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Hanna Reservoir
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Fishing Hanna Reservoir
Location
County Ranking
Ranked #6 of 10 lakes in Carbon County
Nearby Lakes in Carbon County
Explore Hanna Reservoir across LakeGrade
More Wyoming Lake Rankings
Other Grade B Lakes in Wyoming
Natrona County · 5.8 ft
Natrona County · 10.7 ft
Natrona County · 11.1 ft
Albany County · 11.2 ft
Natrona County · 11.3 ft
Natrona County · 12.8 ft
Oligotrophic Lakes in Wyoming
More records, surveys & data sources
Where this data comes from
3 measurements from 1 monitoring station, 2017. Retrieved from the EPA Water Quality Portal on 2026-08-02.
Collected and reported by
- State of Wyoming Department of Environmental Quality Watershed Program
WYDEQ_WATERSHED3 samples · 2017
Analytical methods
- Total Phosphorus After Block Digestion
Monitoring station identifiers (1)
Grade thresholds come from the U.S. EPA National Lakes Assessment 2022 Technical Support Document (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2017-09-18
Monitoring stations: 1