Reservoir · Wyoming · United States · BOR RISE
Keyhole Reservoir
Keyhole Reservoir and Dam
24.3% full
Capacity
412.25 hm³
Volume stored
100 hm³
Vs month average
73% of normal
Coordinates
44.382°N, 104.779°W
Last updated
2026-10-27
Current fill
24.3%vs 7 days ago
-0.1 pplosing
vs 1 year ago
-9.0 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
73%of normal
24.3% full on 2026-10-27, against an average of 33.4% for October across 6 years of readings (-9.1 points).
Drought Monitor at this site · 20 October 2026
D3extreme drought
The ground at Keyhole Reservoir's coordinates falls inside the D3 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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.382°N, 104.779°W · Open in Google Maps
About Keyhole Reservoir
As of October 27, 2026, Keyhole Reservoir is filled to 24.3% of its total capacity, holding 100.21 hm³ of water out of a maximum 412.25 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.1 pp), and it is 9.0 points below its level on the same date a year earlier.
Across the readings we hold for Keyhole Reservoir — 1953 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 24.3% (October 25, 2026) to a high of 40.5% (June 11, 2022). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It is at 44.382°N, 104.779°W.
Key facts
- Current fill level
- 24.3% of total capacity
- Water stored
- 100.21 hm³
- Total capacity
- 412.25 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- ▼ 9.0 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 44.382°N, 104.779°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 24.3% | 100.21 |
| 26 Oct 2026 | 24.3% | 100.27 |
| 25 Oct 2026 | 24.3% | 100.33 |
| 24 Oct 2026 | 24.4% | 100.39 |
| 23 Oct 2026 | 24.4% | 100.5 |
| 22 Oct 2026 | 24.4% | 100.5 |
| 21 Oct 2026 | 24.4% | 100.56 |
| 20 Oct 2026 | 24.4% | 100.62 |
| 19 Oct 2026 | 24.4% | 100.62 |
| 18 Oct 2026 | 24.4% | 100.68 |
| 17 Oct 2026 | 24.4% | 100.73 |
| 16 Oct 2026 | 24.4% | 100.79 |