Hanna Water Supply Lake
Carbon County, WyomingView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Oligotrophic
- #7 of 10 in the county
- Limited data
Hanna Water Supply Lake in Carbon County, Wyoming has a water quality grade of B (Good). Phosphorus: 10 µg/L.
- Type
- Oligotrophic
- Phosphorus
- 10 µg/L
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Hanna Water Supply Lake 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 Water Supply Lake ranks #7 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2017-09-18. Grade methodology: LakeQuality methodology.
Swimming Safety
Grade onlyLimited data
Based on clarity and algae grades from past sampling — we do not hold live water temperature and a current cyanobacteria reading for this lake. Check your state or county health department before you swim.
The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Water Quality Grade: B (Good)
No clarity data. Phosphorus 10 µg/L. TSI 37. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | 10 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 37 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Fishing Hanna Water Supply Lake
County Ranking
Ranked #7 of 10 lakes in Carbon County
Nearby Lakes in Carbon County
Frequently asked questions about Hanna Water Supply Lake
Where is Hanna Water Supply Lake?
- Hanna Water Supply Lake is a lake in Carbon County, Wyoming. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Hanna Water Supply Lake?
- Hanna Water Supply Lake in Carbon County, Wyoming has a water quality grade of B (Good). Phosphorus: 10 µg/L.
Is Hanna Water Supply Lake safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Hanna Water Supply Lake across LakeQuality
18.8 mi away · recorded at 129°F
Species activity outlook by water temperature and season
Where to stay at Wyoming's top lakes, each with its grade
Low nutrients, clear water. The letter is not a swimming clearance.
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Other Grade B Lakes in Wyoming
Oligotrophic Lakes in Wyoming
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 from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion. See how grades are calculated and data sources.