Reservoir · Wyoming · United States · BOR RISE
Seminoe Reservoir Dam and Powerplant
31.4% full
Capacity
1,254.8 hm³
Volume stored
394 hm³
Coordinates
42.156°N, 106.908°W
Last updated
2026-07-28
Current fill
31.4%vs 7 days ago
-0.4%losing
vs 1 year ago
-7.5%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: 2026-07-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.156, -106.908 · Open in Google Maps
About Seminoe Reservoir Dam and Powerplant
As of July 28, 2026, Seminoe Reservoir Dam and Powerplant is filled to 31.4% of its total capacity, holding roughly 394 hm³ of water out of a maximum 1,255 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.4 pts), and it is 7.5 points below its level on the same date a year earlier.
Across the readings we hold for Seminoe Reservoir Dam and Powerplant — 1828 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 27.4% (March 1, 2022) to a high of 86.4% (June 28, 2023). On average the reservoir is fullest around June and at its lowest around March.
It is operated by BOR primarily for multiple purposes. It lies within the Wyoming basin at 42.156°N, 106.908°W.
Key facts
- Current fill level
- 31.4%
- Water stored
- 394 hm³
- Total capacity
- 1,255 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 7.5 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 42.156°N, 106.908°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 31.4% | 394 |
| 27 Jul 2026 | 31.8% | 398 |
| 26 Jul 2026 | 32.0% | 402 |
| 25 Jul 2026 | 32.3% | 406 |
| 24 Jul 2026 | 32.6% | 409 |
| 23 Jul 2026 | 32.9% | 413 |
| 22 Jul 2026 | 33.2% | 417 |
| 21 Jul 2026 | 33.5% | 421 |
| 20 Jul 2026 | 33.6% | 422 |
| 19 Jul 2026 | 33.8% | 425 |
| 18 Jul 2026 | 34.0% | 427 |
| 17 Jul 2026 | 34.2% | 429 |
Frequently asked questions
What is the current water level of Seminoe Reservoir Dam and Powerplant?
As of July 28, 2026, Seminoe Reservoir Dam and Powerplant is at 31.4% of its capacity, holding approximately 394 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Seminoe Reservoir Dam and Powerplant reservoir full?
No. As of July 28, 2026, Seminoe Reservoir Dam and Powerplant is low at 31.4% of its capacity, so it is not full.
Is the water level at Seminoe Reservoir Dam and Powerplant rising or falling?
The level at Seminoe Reservoir Dam and Powerplant has been broadly stable over the latest week on record (-0.4 points).
How much water can Seminoe Reservoir Dam and Powerplant hold?
Seminoe Reservoir Dam and Powerplant has a total capacity of 1,255 hm³.
Where is Seminoe Reservoir Dam and Powerplant reservoir located?
Seminoe Reservoir Dam and Powerplant is located in Wyoming, United States, within the Wyoming basin (coordinates 42.156°N, 106.908°W).
What is Seminoe Reservoir Dam and Powerplant used for?
Seminoe Reservoir Dam and Powerplant is used primarily for multiple purposes, and is managed by BOR.