Seminoe Reservoir Lacustrine Pelagic
Carbon County, WyomingView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↓ down from A at the last regrade
- Oligotrophic
- #3 of 10 in the county
- Public access
- Limited data
Seminoe Reservoir Lacustrine Pelagic in Carbon County, Wyoming has a water quality grade of B (Good). Water clarity: 17.1 ft visibility. Phosphorus: 15 µg/L.
- Clarity
- 17.1 ft
- Type
- Oligotrophic
- Phosphorus
- 15 µg/L
- Trend
- ↑ Improving
- Public access
- Yes
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Seminoe Reservoir Lacustrine Pelagic is a cold, clear oligotrophic lake in Carbon County, Wyoming. Water quality is graded B based on 1 sampling years through 2016. Overall water quality is improving over recent sampling years. Limited fish-species data available. Public access is available with 2 public boat landings. Compared to the 9 other monitored lakes in Carbon County, Seminoe Reservoir Lacustrine Pelagic ranks #3 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2016-09-12. Grade methodology: LakeQuality methodology.
What Seminoe Reservoir Lacustrine Pelagic is good for
From access and monitoring records, not editorial picks.
- Clear water17.1 ft of visibility
- Boat launch2 documented ramps
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)
Crystal clear, you can see 17.1 ft down. Phosphorus 15 µg/L. TSI 40. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 17.1 ft | Not graded |
| Phosphorus | 15 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 40 | Oligotrophic |
Low nutrients, clear water. The letter is not a swimming clearance.
Recreation & Access
- Seminoe Reservoir - NorthPublic
- Seminoe Reservoir - SouthPublic
Named access points in the USGS National Boat Ramps inventory, within about 3 miles. More lakes with boat ramps
Fishing Seminoe Reservoir Lacustrine Pelagic
Water Quality Trend: ↑ Improving
Based on 5 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Phosphorus | ↑ Improving | -1.5 µg/L/yr | 5 |
County Ranking
Ranked #3 of 10 lakes in Carbon County
Nearby Lakes in Carbon County
Frequently asked questions about Seminoe Reservoir Lacustrine Pelagic
Where is Seminoe Reservoir Lacustrine Pelagic?
- Seminoe Reservoir Lacustrine 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 Lacustrine Pelagic?
- Seminoe Reservoir Lacustrine Pelagic in Carbon County, Wyoming has a water quality grade of B (Good). Water clarity: 17.1 ft visibility. Phosphorus: 15 µg/L.
Is Seminoe Reservoir Lacustrine Pelagic safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Are there boat ramps on Seminoe Reservoir Lacustrine Pelagic?
- Seminoe Reservoir Lacustrine Pelagic has 2 documented boat landings in the USGS National Boat Ramps inventory. Named access points include Seminoe Reservoir - North, Seminoe Reservoir - South. Public access is listed as yes.
Explore Seminoe Reservoir Lacustrine Pelagic across LakeQuality
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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Where this data comes from
15 measurements from 1 monitoring station, 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_WATERSHED15 samples · 2012–2016
Analytical methods
- Secchi
- 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.
Other records on this page
Named boat-access points from the USGS National Boat Ramps inventory