Reservoir · Wyoming · United States · BOR RISE
Gray Reef Reservoir and Dam
83.9% full
Capacity
2.23 hm³
Volume stored
2 hm³
Coordinates
42.566°N, 106.699°W
Last updated
2026-06-09
Current fill
83.9%vs 7 days ago
+0.9%gaining
vs 1 year ago
-10.7%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: 2026-06-09.
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 June 9, 2026, Gray Reef Reservoir and Dam is filled to 83.9% 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 (+0.9 pts), and it is 10.7 points below its level on the same date a year earlier.
Across the readings we hold for Gray Reef Reservoir and Dam — 1823 data points between June 13, 2021 and June 9, 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 July 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
- 83.9%
- Water stored
- 2 hm³
- Total capacity
- 2 hm³
- 7-day change
- ▲ 0.9 pts
- Year-on-year
- ▼ 10.7 pts
- Primary use
- Multipurpose
- River basin
- Wyoming
- Operator
- BOR
- Coordinates
- 42.566°N, 106.699°W
- Last updated
- June 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Jun 2026 | 83.9% | 2 |
| 8 Jun 2026 | 83.0% | 2 |
| 7 Jun 2026 | 81.6% | 2 |
| 6 Jun 2026 | 81.2% | 2 |
| 5 Jun 2026 | 80.3% | 2 |
| 4 Jun 2026 | 79.4% | 2 |
| 3 Jun 2026 | 80.3% | 2 |
| 2 Jun 2026 | 80.3% | 2 |
| 1 Jun 2026 | 80.3% | 2 |
| 31 May 2026 | 80.7% | 2 |
| 30 May 2026 | 81.2% | 2 |
| 29 May 2026 | 82.1% | 2 |
Frequently asked questions
What is the current water level of Gray Reef Reservoir and Dam?
As of June 9, 2026, Gray Reef Reservoir and Dam is at 83.9% 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 June 9, 2026, Gray Reef Reservoir and Dam is high at 83.9% 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 (+0.9 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.