Seminoe Reservoir Riverine Pelagic
Carbon County, WyomingView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- #1 of 10 in the county
- Limited data
Seminoe Reservoir Riverine Pelagic in Carbon County, Wyoming has a water quality grade of B (Good). Water clarity: 4.4 ft visibility. Phosphorus: 30 µg/L.
- Clarity
- 4.4 ft
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Trend
- ↓ Declining
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Watch Seminoe Reservoir Riverine Pelagic’s letter
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Seminoe Reservoir Riverine Pelagic is a productive, nutrient-rich eutrophic lake in Carbon County, Wyoming. Water quality is graded B based on 1 sampling years through 2016. Overall water quality is declining over recent sampling years. Compared to the 9 other monitored lakes in Carbon County, Seminoe Reservoir Riverine Pelagic ranks #1 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2016-09-12. 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)
Murky, only visible to about 4.4 ft. Phosphorus 30 µg/L. TSI 55. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 4.4 ft | Not graded |
| Phosphorus | 30 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 55 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Seminoe Reservoir Riverine Pelagic
Water Quality Trend: ↓ Declining
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↓ Declining | +4.5 µg/L/yr | 5 |
County Ranking
Ranked #1 of 10 lakes in Carbon County
Nearby Lakes in Carbon County
Frequently asked questions about Seminoe Reservoir Riverine Pelagic
Where is Seminoe Reservoir Riverine Pelagic?
- Seminoe Reservoir Riverine Pelagic 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 Seminoe Reservoir Riverine Pelagic?
- Seminoe Reservoir Riverine Pelagic in Carbon County, Wyoming has a water quality grade of B (Good). Water clarity: 4.4 ft visibility. Phosphorus: 30 µg/L.
Is Seminoe Reservoir Riverine Pelagic safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Seminoe Reservoir Riverine Pelagic across LakeQuality
More Wyoming Lake Rankings
Other Grade B Lakes in Wyoming
Eutrophic Lakes in Wyoming
Where this data comes from
14 measurements from 2 monitoring stations, 2012–2016. 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_WATERSHED14 samples · 2012–2016
Analytical methods
- Secchi
- Total Phosphorus After Block Digestion
Monitoring station identifiers (2)
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.