Reservoir · Colorado · United States · BOR RISE
Willow Creek Reservoir
Willow Creek Reservoir and Dam (CO)
71.0% full
Capacity
13.02 hm³
Volume stored
9 hm³
Coordinates
40.148°N, 105.942°W
Last updated
2026-09-09
Current fill
71.0%vs 7 days ago
-0.4%losing
vs 1 year ago
-1.7%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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.148, -105.942 · Open in Google Maps
About Willow Creek Reservoir
As of September 9, 2026, Willow Creek Reservoir is filled to 71.0% of its total capacity, holding roughly 9 hm³ of water out of a maximum 13 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 (-0.4 pts), and it is 1.7 points below its level on the same date a year earlier.
Across the readings we hold for Willow Creek Reservoir — 1950 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 50.2% (December 7, 2023) to a high of 89.9% (May 8, 2022). On average the reservoir is fullest around March and at its lowest around December.
It is operated by BOR primarily for multiple purposes. It lies within the Colorado basin at 40.148°N, 105.942°W.
Key facts
- Current fill level
- 71.0%
- Water stored
- 9 hm³
- Total capacity
- 13 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 1.7 pts
- Primary use
- Multipurpose
- River basin
- Colorado
- Operator
- BOR
- Coordinates
- 40.148°N, 105.942°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 71.0% | 9 |
| 8 Sep 2026 | 71.6% | 9 |
| 7 Sep 2026 | 71.5% | 9 |
| 6 Sep 2026 | 71.5% | 9 |
| 5 Sep 2026 | 71.5% | 9 |
| 4 Sep 2026 | 71.5% | 9 |
| 3 Sep 2026 | 71.5% | 9 |
| 2 Sep 2026 | 71.4% | 9 |
| 1 Sep 2026 | 71.4% | 9 |
| 31 Aug 2026 | 71.2% | 9 |
| 30 Aug 2026 | 71.0% | 9 |
| 29 Aug 2026 | 71.0% | 9 |