Reservoir · Wyoming · United States · BOR RISE
Alcova Reservoir
Alcova Reservoir Dam and Powerplant
98.1% full
Capacity
227.46 hm³
Volume stored
223 hm³
Coordinates
42.549°N, 106.721°W
Last updated
2026-09-09
Current fill
98.1%vs 7 days ago
0.0%stable
vs 1 year ago
+0.1%year-over-year
7-day trend
→stable
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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.549, -106.721 · Open in Google Maps
About Alcova Reservoir
As of September 9, 2026, Alcova Reservoir is filled to 98.1% of its total capacity, holding roughly 223 hm³ of water out of a maximum 227 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Alcova Reservoir — 1953 data points between September 12, 2021 and September 9, 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 lies within the Wyoming basin at 42.549°N, 106.721°W.
Key facts
- Current fill level
- 98.1%
- Water stored
- 223 hm³
- Total capacity
- 227 hm³
- 7-day change
- No change
- Year-on-year
- ▲ 0.1 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 42.549°N, 106.721°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 98.1% | 223 |
| 8 Sep 2026 | 98.0% | 223 |
| 7 Sep 2026 | 98.0% | 223 |
| 6 Sep 2026 | 98.1% | 223 |
| 5 Sep 2026 | 98.1% | 223 |
| 4 Sep 2026 | 98.1% | 223 |
| 3 Sep 2026 | 98.1% | 223 |
| 2 Sep 2026 | 98.1% | 223 |
| 1 Sep 2026 | 98.1% | 223 |
| 31 Aug 2026 | 98.4% | 224 |
| 30 Aug 2026 | 98.4% | 224 |
| 29 Aug 2026 | 98.3% | 224 |