Reservoir · Wyoming · United States · BOR RISE
Boysen Reservoir Dam and Powerplant
77.9% full
Capacity
865.3 hm³
Volume stored
674 hm³
Coordinates
43.400°N, 108.177°W
Last updated
2026-06-10
Current fill
77.9%vs 7 days ago
+0.2%gaining
vs 1 year ago
+1.8%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: 2026-06-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.400, -108.177 · Open in Google Maps
About Boysen Reservoir Dam and Powerplant
As of June 10, 2026, Boysen Reservoir Dam and Powerplant is filled to 77.9% of its total capacity, holding roughly 674 hm³ of water out of a maximum 865 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (+0.2 pts), and it is 1.8 points above its level on the same date a year earlier.
Across the readings we hold for Boysen Reservoir Dam and Powerplant — 1830 data points between June 13, 2021 and June 10, 2026 — the level has ranged from a low of 71.0% (May 12, 2023) to a high of 105.0% (June 17, 2023). On average the reservoir is fullest around July and at its lowest around May.
It is operated by BOR primarily for multiple purposes. It lies within the Wyoming basin at 43.400°N, 108.177°W.
Key facts
- Current fill level
- 77.9%
- Water stored
- 674 hm³
- Total capacity
- 865 hm³
- 7-day change
- ▲ 0.2 pts
- Year-on-year
- ▲ 1.8 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 43.400°N, 108.177°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 77.9% | 674 |
| 9 Jun 2026 | 77.7% | 672 |
| 8 Jun 2026 | 77.4% | 670 |
| 7 Jun 2026 | 76.7% | 664 |
| 6 Jun 2026 | 76.5% | 662 |
| 5 Jun 2026 | 76.4% | 662 |
| 4 Jun 2026 | 76.2% | 659 |
| 3 Jun 2026 | 75.9% | 657 |
| 2 Jun 2026 | 75.6% | 654 |
| 1 Jun 2026 | 75.4% | 652 |
| 31 May 2026 | 74.3% | 643 |
| 30 May 2026 | 73.9% | 639 |
Frequently asked questions
What is the current water level of Boysen Reservoir Dam and Powerplant?
As of June 10, 2026, Boysen Reservoir Dam and Powerplant is at 77.9% of its capacity, holding approximately 674 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Boysen Reservoir Dam and Powerplant reservoir full?
No. As of June 10, 2026, Boysen Reservoir Dam and Powerplant is within its normal operating range at 77.9% of its capacity, so it is not full.
Is the water level at Boysen Reservoir Dam and Powerplant rising or falling?
The level at Boysen Reservoir Dam and Powerplant has been broadly stable over the latest week on record (+0.2 points).
How much water can Boysen Reservoir Dam and Powerplant hold?
Boysen Reservoir Dam and Powerplant has a total capacity of 865 hm³.
Where is Boysen Reservoir Dam and Powerplant reservoir located?
Boysen Reservoir Dam and Powerplant is located in Wyoming, United States, within the Wyoming basin (coordinates 43.400°N, 108.177°W).
What is Boysen Reservoir Dam and Powerplant used for?
Boysen Reservoir Dam and Powerplant is used primarily for multiple purposes, and is managed by BOR.