Alcova Reservoir Lacustrine Pelagic
Natrona County, Wyoming2,471 acresView mapDirections
Clarity, phosphorus, and algae sit in the clean band for this region.
- Mesotrophic
- #4 of 5 in the county
- Limited data
Alcova Reservoir Lacustrine Pelagic in Natrona County, Wyoming has a water quality grade of B (Good). Water clarity: 12.8 ft visibility. Phosphorus: 20 µg/L. Surface area: 2471 acres.
- Clarity
- 12.8 ft
- Area
- 2,471 acres
- Type
- Mesotrophic
- Phosphorus
- 20 µg/L
- Trend
- → Stable
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Watch Alcova Reservoir Lacustrine Pelagic’s letter
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Alcova Reservoir Lacustrine Pelagic is a 2,471-acre mesotrophic lake in Natrona County, Wyoming. Water quality is graded B based on 1 sampling years through 2018. Water clarity is improving over recent sampling years. Compared to the 4 other monitored lakes in Natrona County, Alcova Reservoir Lacustrine Pelagic ranks #4 for water quality.
Source: EPA Water Quality Portal sampling records, Wyoming DEQ, last sampled 2018-09-18. Grade methodology: LakeQuality methodology.
What Alcova Reservoir Lacustrine Pelagic is good for
From access and monitoring records, not editorial picks.
- Clear water12.8 ft of visibility
- Big water2,471 acres
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)
Good clarity, visible to about 12.8 ft. Phosphorus 20 µg/L. TSI 44. The letter is not a swimming clearance.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 12.8 ft | Not graded |
| Phosphorus | 20 µg/L | Good |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) | 44 | Mesotrophic |
Moderate nutrients, good water quality
Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 2,471 acres |
No bathymetric survey has been published for Alcova Reservoir Lacustrine Pelagic, so its depth is not documented here.
Fishing Alcova Reservoir Lacustrine Pelagic
Water Quality Trend: → Stable
Based on 3 years of monitoring data (2020-2025).
| Metric | Trend | Change/Year | Years |
|---|---|---|---|
| Water Clarity | ↑ Improving | +0.362 m/yr | 2 |
| Phosphorus | ↓ Declining | +0.65 µg/L/yr | 3 |
Reservoir Info (USACE NID)
Alcova Reservoir Lacustrine Pelagic is a man-made reservoir impounded by the Alcova Dam (completed 1938), built primarily for hydroelectric on the North Platte River; earth-type dam, 265 ft tall and 763 ft long.
- Surface area
- 2,471 ac
- Normal storage
- 184,405 ac-ft
- Max storage
- 184,405 ac-ft
- Drainage area
- 10,736.52 sq mi
- Hazard class
- High
- Owner
- BUREAU OF RECLAMATION
All listed purposes: Hydroelectric;Irrigation.
Source: USACE National Inventory of Dams, NID ID WY01290 · Operator website · Matched by proximity (0.62 km)
County Ranking
Ranked #4 of 5 lakes in Natrona County
Nearby Lakes in Natrona County
Frequently asked questions about Alcova Reservoir Lacustrine Pelagic
Where is Alcova Reservoir Lacustrine Pelagic?
- Alcova Reservoir Lacustrine 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 Lacustrine Pelagic?
- Alcova Reservoir Lacustrine Pelagic in Natrona County, Wyoming has a water quality grade of B (Good). Water clarity: 12.8 ft visibility. Phosphorus: 20 µg/L. Surface area: 2471 acres.
Is Alcova Reservoir Lacustrine Pelagic safe to swim in?
- The B is nutrients and algae, not a swimming clearance. Check local advisories before you swim.
Explore Alcova Reservoir Lacustrine Pelagic across LakeQuality
0.1 mi away · recorded at 129°F
Species activity outlook by water temperature and season
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Moderate nutrients, good water quality
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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.