Reservoir · Wyoming · United States · BOR RISE
Buffalo Bill Reservoir
Buffalo Bill Reservoir Dam and Powerplant
72.8% full
Capacity
797.53 hm³
Volume stored
580 hm³
Coordinates
44.501°N, 109.183°W
Last updated
2026-09-12
Current fill
72.8%vs 7 days ago
-3.1%losing
vs 1 year ago
+10.4%year-over-year
7-day trend
↓falling
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: 2026-09-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.501, -109.183 · Open in Google Maps
About Buffalo Bill Reservoir
As of September 12, 2026, Buffalo Bill Reservoir is filled to 72.8% of its total capacity, holding roughly 580 hm³ of water out of a maximum 798 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 3.1 percentage points, and it is 10.4 points above its level on the same date a year earlier.
Across the readings we hold for Buffalo Bill Reservoir — 1953 data points between September 15, 2021 and September 12, 2026 — the level has ranged from a low of 52.5% (October 14, 2025) to a high of 98.0% (July 17, 2022). On average the reservoir is fullest around July and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Wyoming basin at 44.501°N, 109.183°W.
Key facts
- Current fill level
- 72.8%
- Water stored
- 580 hm³
- Total capacity
- 798 hm³
- 7-day change
- ▼ 3.1 pts
- Year-on-year
- ▲ 10.4 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 44.501°N, 109.183°W
- Last updated
- September 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Sep 2026 | 72.8% | 580 |
| 11 Sep 2026 | 73.2% | 584 |
| 10 Sep 2026 | 73.7% | 588 |
| 9 Sep 2026 | 74.1% | 591 |
| 8 Sep 2026 | 74.5% | 594 |
| 7 Sep 2026 | 75.0% | 598 |
| 6 Sep 2026 | 75.4% | 602 |
| 5 Sep 2026 | 75.9% | 605 |
| 4 Sep 2026 | 76.3% | 608 |
| 3 Sep 2026 | 76.7% | 612 |
| 2 Sep 2026 | 77.2% | 615 |
| 1 Sep 2026 | 77.6% | 619 |