Alcova Reservoir Riverine Pelagic
Natrona County, WyomingView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
↑ up from C at the last regrade
- Eutrophic
- #5 of 5 in the county
- Limited data
Alcova Reservoir Riverine Pelagic in Natrona County, Wyoming has a water quality grade of B (Good). Water clarity: 5.8 ft visibility. Phosphorus: 30 µg/L.
- Clarity
- 5.8 ft
- Type
- Eutrophic
- Phosphorus
- 30 µg/L
- Trend
- ↑ Improving
Stays via Stay22
Stays near Alcova Reservoir Riverine Pelagic
Compare lakeside cabins, hotels, and vacation rentals near Alcova Reservoir Riverine Pelagic in Natrona County, Wyoming — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Alcova Reservoir Riverine Pelagic
Prices for Sep 11–13, 4 adults. Change dates on the map below.
Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.
Planning a whole trip? See where to stay at Wyoming’s top lakes →
Watch Alcova Reservoir Riverine Pelagic’s letter
Email me if this lake’s grade moves. Grades stay free.
Or email
Alcova Reservoir Riverine Pelagic is a productive, nutrient-rich eutrophic lake in Natrona County, Wyoming. Water quality is graded B based on 1 sampling years through 2018. Overall water quality is improving over recent sampling years. Compared to the 4 other monitored lakes in Natrona County, Alcova Reservoir Riverine Pelagic ranks #5 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2018-09-18. 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)
Murky, only visible to about 5.8 ft. Phosphorus 30 µg/L. TSI 52. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.8 ft | Not graded |
| Phosphorus | 30 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 52 | Eutrophic |
High nutrients, frequent algae, reduced clarity
Fishing Alcova Reservoir Riverine Pelagic
Water Quality Trend: ↑ Improving
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.175 m/yr | 2 |
| Phosphorus | ↑ Improving | -1.69 µg/L/yr | 3 |
County Ranking
Ranked #5 of 5 lakes in Natrona County
Nearby Lakes in Natrona County
Frequently asked questions about Alcova Reservoir Riverine Pelagic
Where is Alcova Reservoir Riverine Pelagic?
- Alcova Reservoir Riverine Pelagic is a lake in Natrona County, Wyoming. LakeQuality grades it B for nutrients and algae. The letter is not a swimming clearance.
What is the water quality grade for Alcova Reservoir Riverine Pelagic?
- Alcova Reservoir Riverine Pelagic in Natrona County, Wyoming has a water quality grade of B (Good). Water clarity: 5.8 ft visibility. Phosphorus: 30 µg/L.
Is Alcova Reservoir Riverine Pelagic safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Alcova Reservoir Riverine Pelagic across LakeQuality
More Wyoming Lake Rankings
Other Grade B Lakes in Wyoming
Eutrophic Lakes in Wyoming
Where this data comes from
9 measurements from 1 monitoring station, 2012–2018. 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_WATERSHED9 samples · 2012–2018
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.