Reservoir · Montana · United States · BOR RISE
Willow Creek Reservoir and Dam (MT)
76.5% full
Capacity
39.84 hm³
Volume stored
31 hm³
Coordinates
47.547°N, 112.429°W
Last updated
2026-06-10
Current fill
76.5%vs 7 days ago
-0.2%losing
vs 1 year ago
+25.5%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: 2026-06-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 47.547, -112.429 · Open in Google Maps
About Willow Creek Reservoir and Dam (MT)
As of June 10, 2026, Willow Creek Reservoir and Dam (MT) is filled to 76.5% of its total capacity, holding roughly 31 hm³ of water out of a maximum 40 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.2 pts), and it is 25.5 points above its level on the same date a year earlier.
Across the readings we hold for Willow Creek Reservoir and Dam (MT) — 1911 data points between June 13, 2021 and June 10, 2026 — the level has ranged from a low of 12.4% (October 24, 2025) to a high of 99.5% (June 25, 2021). On average the reservoir is fullest around June and at its lowest around September.
It is operated by BOR primarily for multiple purposes. It lies within the Montana basin at 47.547°N, 112.429°W.
Key facts
- Current fill level
- 76.5%
- Water stored
- 31 hm³
- Total capacity
- 40 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▲ 25.5 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 47.547°N, 112.429°W
- Last updated
- June 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Jun 2026 | 76.5% | 30 |
| 9 Jun 2026 | 76.7% | 31 |
| 8 Jun 2026 | 76.3% | 30 |
| 7 Jun 2026 | 75.7% | 30 |
| 6 Jun 2026 | 75.4% | 30 |
| 5 Jun 2026 | 74.9% | 30 |
| 4 Jun 2026 | 74.5% | 30 |
| 3 Jun 2026 | 74.3% | 30 |
| 2 Jun 2026 | 73.8% | 29 |
| 1 Jun 2026 | 73.3% | 29 |
| 31 May 2026 | 72.5% | 29 |
| 30 May 2026 | 71.7% | 29 |
Frequently asked questions
What is the current water level of Willow Creek Reservoir and Dam (MT)?
As of June 10, 2026, Willow Creek Reservoir and Dam (MT) is at 76.5% of its capacity, holding approximately 31 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Willow Creek Reservoir and Dam (MT) reservoir full?
No. As of June 10, 2026, Willow Creek Reservoir and Dam (MT) is within its normal operating range at 76.5% of its capacity, so it is not full.
Is the water level at Willow Creek Reservoir and Dam (MT) rising or falling?
The level at Willow Creek Reservoir and Dam (MT) has been broadly stable over the latest week on record (-0.2 points).
How much water can Willow Creek Reservoir and Dam (MT) hold?
Willow Creek Reservoir and Dam (MT) has a total capacity of 40 hm³.
Where is Willow Creek Reservoir and Dam (MT) reservoir located?
Willow Creek Reservoir and Dam (MT) is located in Montana, United States, within the Montana basin (coordinates 47.547°N, 112.429°W).
What is Willow Creek Reservoir and Dam (MT) used for?
Willow Creek Reservoir and Dam (MT) is used primarily for multiple purposes, and is managed by BOR.