Reservoir · Wyoming · United States · USACE CWMS
Keyhole Dam & Reservoir
28.7% full
Capacity
412.25 hm³
Volume stored
118 hm³
Coordinates
44.383°N, 104.779°W
Last updated
2026-07-29
Current fill
28.7%vs 7 days ago
-0.1%losing
vs 1 year ago
-3.3%year-over-year
7-day trend
→stable
Data source: USACE CWMS — US Army Corps of Engineers — 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: 2026-07-29.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.383, -104.779 · Open in Google Maps
About Keyhole Dam & Reservoir
As of July 29, 2026, Keyhole Dam & Reservoir 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 3.3 points below its level on the same date a year earlier.
Across the readings we hold for Keyhole Dam & Reservoir — 1821 data points between July 31, 2021 and July 29, 2026 — the level has ranged from a low of 28.7% (July 29, 2026) to a high of 41.5% (July 31, 2021). On average the reservoir is fullest around August and at its lowest around December.
It is operated by USACE primarily for multiple purposes. It lies within the Wyoming basin at 44.383°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
- ▼ 3.3 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- USACE
- Coordinates
- 44.383°N, 104.779°W
- Last updated
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 28.7% | 118 |
| 28 Jul 2026 | 28.8% | 119 |
| 27 Jul 2026 | 29.0% | 120 |
| 26 Jul 2026 | 29.0% | 120 |
| 25 Jul 2026 | 29.1% | 120 |
| 24 Jul 2026 | 29.3% | 121 |
| 23 Jul 2026 | 29.4% | 121 |
| 22 Jul 2026 | 29.5% | 121 |
| 21 Jul 2026 | 29.6% | 122 |
| 20 Jul 2026 | 29.7% | 122 |
| 19 Jul 2026 | 29.8% | 123 |
| 18 Jul 2026 | 29.9% | 123 |
Frequently asked questions
What is the current water level of Keyhole Dam & Reservoir?
As of July 29, 2026, Keyhole Dam & Reservoir is at 28.7% of its capacity, holding approximately 118 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Keyhole Dam & Reservoir reservoir full?
No. As of July 29, 2026, Keyhole Dam & Reservoir is low at 28.7% of its capacity, so it is not full.
Is the water level at Keyhole Dam & Reservoir rising or falling?
The level at Keyhole Dam & Reservoir has been broadly stable over the latest week on record (-0.1 points).
How much water can Keyhole Dam & Reservoir hold?
Keyhole Dam & Reservoir has a total capacity of 412 hm³.
Where is Keyhole Dam & Reservoir reservoir located?
Keyhole Dam & Reservoir is located in Wyoming, United States, within the Wyoming basin (coordinates 44.383°N, 104.779°W).
What is Keyhole Dam & Reservoir used for?
Keyhole Dam & Reservoir is used primarily for multiple purposes, and is managed by USACE.