Reservoir · Wyoming · United States · BOR RISE
Seminoe Reservoir
Seminoe Reservoir Dam and Powerplant
22.5% full
Capacity
1,254.8 hm³
Volume stored
282 hm³
Vs month average
48% of normal
Coordinates
42.156°N, 106.908°W
Last updated
2026-10-12
Current fill
22.5%vs 7 days ago
-0.5%losing
vs 1 year ago
-14.0%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
48%of normal
22.5% full on 2026-10-12, against an average of 46.5% for October across 6 years of readings (-24.0 points).
Drought Monitor at this site · 6 October 2026
D2severe drought
The ground at Seminoe 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: 2026-10-12.
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
As of October 12, 2026, Seminoe Reservoir is filled to 22.5% of its total capacity, holding roughly 282 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 (-0.5 pts), and it is 14.0 points below its level on the same date a year earlier.
Across the readings we hold for Seminoe Reservoir — 1954 data points between October 14, 2021 and October 12, 2026 — the level has ranged from a low of 22.5% (October 12, 2026) to a high of 86.4% (June 28, 2023). On average the reservoir is fullest around June and at its lowest around February.
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
- 22.5%
- Water stored
- 282 hm³
- Total capacity
- 1,255 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▼ 14.0 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 42.156°N, 106.908°W
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 22.5% | 282 |
| 11 Oct 2026 | 22.6% | 283 |
| 10 Oct 2026 | 22.7% | 285 |
| 9 Oct 2026 | 22.7% | 285 |
| 8 Oct 2026 | 22.8% | 286 |
| 7 Oct 2026 | 22.8% | 286 |
| 6 Oct 2026 | 22.9% | 287 |
| 5 Oct 2026 | 23.0% | 288 |
| 4 Oct 2026 | 23.0% | 289 |
| 3 Oct 2026 | 23.1% | 290 |
| 2 Oct 2026 | 23.2% | 291 |
| 1 Oct 2026 | 23.2% | 292 |