Reservoir · Wyoming · United States · BOR RISE
Seminoe Reservoir
Seminoe Reservoir Dam and Powerplant
21.7% full
Capacity
1,254.8 hm³
Volume stored
272 hm³
Vs month average
48% of normal
Coordinates
42.156°N, 106.908°W
Last updated
2026-10-28
Current fill
21.7%vs 7 days ago
-0.4 pplosing
vs 1 year ago
-14.4 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
48%of normal
21.7% full on 2026-10-28, against an average of 45.5% for October across 6 years of readings (-23.8 points).
Drought Monitor at this site · 27 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: 2026-10-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.156°N, 106.908°W · Open in Google Maps
About Seminoe Reservoir
As of October 28, 2026, Seminoe Reservoir is filled to 21.7% of its total capacity, holding 272.08 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 pp), and it is 14.4 points below its level on the same date a year earlier.
Across the readings we hold for Seminoe Reservoir — 1954 data points between October 30, 2021 and October 28, 2026 — the level has ranged from a low of 21.7% (October 27, 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 is at 42.156°N, 106.908°W.
Key facts
- Current fill level
- 21.7% of total capacity
- Water stored
- 272.08 hm³
- Total capacity
- 1,255 hm³
- 7-day change
- ▼ 0.4 pp
- Year-on-year
- ▼ 14.4 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 42.156°N, 106.908°W
- Last updated
- October 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Oct 2026 | 21.7% | 272.08 |
| 27 Oct 2026 | 21.7% | 272.71 |
| 26 Oct 2026 | 21.8% | 273.5 |
| 25 Oct 2026 | 21.8% | 273.98 |
| 24 Oct 2026 | 21.9% | 274.61 |
| 23 Oct 2026 | 22.0% | 275.49 |
| 22 Oct 2026 | 22.0% | 276.28 |
| 21 Oct 2026 | 22.1% | 277 |
| 20 Oct 2026 | 22.1% | 277.4 |
| 19 Oct 2026 | 22.2% | 277.96 |
| 18 Oct 2026 | 22.2% | 278.52 |
| 17 Oct 2026 | 22.2% | 279.09 |