Reservoir · Utah · United States · BOR RISE
Willard Bay Reservoir
Willard Bay Reservoir and Arthur V Watkins Dam
51.0% full
Capacity
265.82 hm³
Volume stored
136 hm³
Coordinates
41.377°N, 112.083°W
Last updated
2026-09-09
Current fill
51.0%vs 7 days ago
+1.0%gaining
vs 1 year ago
+11.8%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. 41.377, -112.083 · Open in Google Maps
About Willard Bay Reservoir
As of September 9, 2026, Willard Bay Reservoir is filled to 51.0% of its total capacity, holding roughly 136 hm³ of water out of a maximum 266 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 (+1.0 pts), and it is 11.8 points above its level on the same date a year earlier.
Across the readings we hold for Willard Bay Reservoir — 1824 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 31.8% (November 23, 2022) to a high of 102.7% (June 27, 2023). On average the reservoir is fullest around May and at its lowest around December.
It is operated by BOR primarily for multiple purposes. It lies within the Utah basin at 41.377°N, 112.083°W.
Key facts
- Current fill level
- 51.0%
- Water stored
- 136 hm³
- Total capacity
- 266 hm³
- 7-day change
- ▲ 1.0 pts
- Year-on-year
- ▲ 11.8 pts
- Primary use
- Multipurpose
- River basin
- Utah
- Operator
- BOR
- Coordinates
- 41.377°N, 112.083°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 51.0% | 135 |
| 8 Sep 2026 | 50.8% | 135 |
| 7 Sep 2026 | 50.7% | 135 |
| 6 Sep 2026 | 50.4% | 134 |
| 5 Sep 2026 | 50.3% | 134 |
| 4 Sep 2026 | 50.2% | 134 |
| 3 Sep 2026 | 50.1% | 133 |
| 2 Sep 2026 | 50.0% | 133 |
| 1 Sep 2026 | 49.6% | 132 |
| 31 Aug 2026 | 49.2% | 131 |
| 30 Aug 2026 | 49.2% | 131 |
| 29 Aug 2026 | 49.1% | 131 |