Reservoir · Wyoming · United States · BOR RISE
Keyhole Reservoir and Dam
28.7% full
Capacity
412.25 hm³
Volume stored
118 hm³
Coordinates
44.382°N, 104.779°W
Last updated
2026-07-28
Current fill
28.7%vs 7 days ago
-0.1%losing
vs 1 year ago
-3.2%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. 44.382, -104.779 · Open in Google Maps
About Keyhole Reservoir and Dam
As of July 28, 2026, Keyhole Reservoir and Dam is filled to 28.7% of its total capacity, holding roughly 118 hm³ of water out of a maximum 412 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts), and it is 3.2 points below its level on the same date a year earlier.
Across the readings we hold for Keyhole Reservoir and Dam — 1825 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 28.7% (July 28, 2026) to a high of 41.4% (July 31, 2021). On average the reservoir is fullest around August and at its lowest around December.
It is operated by BOR primarily for multiple purposes. It lies within the Wyoming basin at 44.382°N, 104.779°W.
Key facts
- Current fill level
- 28.7%
- Water stored
- 118 hm³
- Total capacity
- 412 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 3.2 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 44.382°N, 104.779°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 28.7% | 118 |
| 27 Jul 2026 | 28.8% | 119 |
| 26 Jul 2026 | 29.0% | 120 |
| 25 Jul 2026 | 29.0% | 120 |
| 24 Jul 2026 | 29.1% | 120 |
| 23 Jul 2026 | 29.3% | 121 |
| 22 Jul 2026 | 29.4% | 121 |
| 21 Jul 2026 | 29.5% | 121 |
| 20 Jul 2026 | 29.6% | 122 |
| 19 Jul 2026 | 29.7% | 122 |
| 18 Jul 2026 | 29.8% | 123 |
| 17 Jul 2026 | 29.9% | 123 |
Frequently asked questions
What is the current water level of Keyhole Reservoir and Dam?
As of July 28, 2026, Keyhole Reservoir and Dam is at 28.7% of its capacity, holding approximately 118 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Keyhole Reservoir and Dam reservoir full?
No. As of July 28, 2026, Keyhole Reservoir and Dam is low at 28.7% of its capacity, so it is not full.
Is the water level at Keyhole Reservoir and Dam rising or falling?
The level at Keyhole Reservoir and Dam has been broadly stable over the latest week on record (-0.1 points).
How much water can Keyhole Reservoir and Dam hold?
Keyhole Reservoir and Dam has a total capacity of 412 hm³.
Where is Keyhole Reservoir and Dam reservoir located?
Keyhole Reservoir and Dam is located in Wyoming, United States, within the Wyoming basin (coordinates 44.382°N, 104.779°W).
What is Keyhole Reservoir and Dam used for?
Keyhole Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.