Reservoir · Wyoming · United States · BOR RISE
Gray Reef Reservoir and Dam
80.7% full
Capacity
2.23 hm³
Volume stored
2 hm³
Coordinates
42.566°N, 106.699°W
Last updated
2026-07-27
Current fill
80.7%vs 7 days ago
+0.4%gaining
vs 1 year ago
+0.4%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: 2026-07-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 42.566, -106.699 · Open in Google Maps
About Gray Reef Reservoir and Dam
As of July 27, 2026, Gray Reef Reservoir and Dam is filled to 80.7% of its total capacity, holding roughly 2 hm³ of water out of a maximum 2 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.4 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Gray Reef Reservoir and Dam — 1822 data points between July 31, 2021 and July 27, 2026 — the level has ranged from a low of 9.0% (March 2, 2026) to a high of 102.7% (March 27, 2023). On average the reservoir is fullest around August and at its lowest around February.
It is operated by BOR primarily for multiple purposes. It lies within the Wyoming basin at 42.566°N, 106.699°W.
Key facts
- Current fill level
- 80.7%
- Water stored
- 2 hm³
- Total capacity
- 2 hm³
- 7-day change
- ▲ 0.4 pts
- Year-on-year
- ▲ 0.4 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 42.566°N, 106.699°W
- Last updated
- July 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Jul 2026 | 80.7% | 2 |
| 26 Jul 2026 | 80.3% | 2 |
| 25 Jul 2026 | 83.9% | 2 |
| 24 Jul 2026 | 81.6% | 2 |
| 23 Jul 2026 | 81.6% | 2 |
| 22 Jul 2026 | 84.3% | 2 |
| 21 Jul 2026 | 82.1% | 2 |
| 20 Jul 2026 | 83.9% | 2 |
| 19 Jul 2026 | 82.5% | 2 |
| 18 Jul 2026 | 81.2% | 2 |
| 17 Jul 2026 | 83.4% | 2 |
| 16 Jul 2026 | 83.9% | 2 |
Frequently asked questions
What is the current water level of Gray Reef Reservoir and Dam?
As of July 27, 2026, Gray Reef Reservoir and Dam is at 80.7% of its capacity, holding approximately 2 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Gray Reef Reservoir and Dam reservoir full?
No. As of July 27, 2026, Gray Reef Reservoir and Dam is high at 80.7% of its capacity, so it is not full.
Is the water level at Gray Reef Reservoir and Dam rising or falling?
The level at Gray Reef Reservoir and Dam has been broadly stable over the latest week on record (+0.4 points).
How much water can Gray Reef Reservoir and Dam hold?
Gray Reef Reservoir and Dam has a total capacity of 2 hm³.
Where is Gray Reef Reservoir and Dam reservoir located?
Gray Reef Reservoir and Dam is located in Wyoming, United States, within the Wyoming basin (coordinates 42.566°N, 106.699°W).
What is Gray Reef Reservoir and Dam used for?
Gray Reef Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.