Reservoir · Wyoming · United States · BOR RISE
Alcova Reservoir
Alcova Reservoir Dam and Powerplant
87.9% full
Capacity
227.46 hm³
Volume stored
200 hm³
Vs month average
96% of normal
Coordinates
42.549°N, 106.721°W
Last updated
2026-10-27
Current fill
87.9%vs 7 days ago
-2.5 pplosing
vs 1 year ago
+1.6 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
96%of normal
87.9% full on 2026-10-27, against an average of 91.3% for October across 6 years of readings (-3.4 points).
Drought Monitor at this site · 20 October 2026
D2severe drought
The ground at Alcova Reservoir's coordinates falls inside the D2 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Wyoming drought figures →
Data source: BOR RISE — US Bureau of Reclamation — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.549°N, 106.721°W · Open in Google Maps
About Alcova Reservoir
As of October 27, 2026, Alcova Reservoir is filled to 87.9% of its total capacity, holding 199.83 hm³ of water out of a maximum 227.46 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 2.5 percentage points, and it is 1.6 points above its level on the same date a year earlier.
Across the readings we hold for Alcova Reservoir — 1954 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 84.7% (March 10, 2026) to a high of 98.6% (June 3, 2023). On average the reservoir is fullest around September and at its lowest around December.
It is operated by BOR primarily for multiple purposes. It is at 42.549°N, 106.721°W.
Key facts
- Current fill level
- 87.9% of total capacity
- Water stored
- 199.83 hm³
- Total capacity
- 227.46 hm³
- 7-day change
- ▼ 2.5 pp
- Year-on-year
- ▲ 1.6 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 42.549°N, 106.721°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 87.9% | 199.83 |
| 26 Oct 2026 | 88.2% | 200.68 |
| 25 Oct 2026 | 88.6% | 201.6 |
| 24 Oct 2026 | 89.0% | 202.34 |
| 23 Oct 2026 | 89.3% | 203.2 |
| 22 Oct 2026 | 89.7% | 204.03 |
| 21 Oct 2026 | 90.1% | 204.89 |
| 20 Oct 2026 | 90.4% | 205.7 |
| 19 Oct 2026 | 90.8% | 206.51 |
| 18 Oct 2026 | 91.2% | 207.35 |
| 17 Oct 2026 | 91.5% | 208.22 |
| 16 Oct 2026 | 91.9% | 209.06 |