Reservoir · Oregon · United States · BOR RISE
Prineville Reservoir
Prineville Reservoir and Arthur R. Bowman Dam
22.9% full
Capacity
185.29 hm³
Volume stored
43 hm³
Coordinates
44.111°N, 120.787°W
Last updated
2026-09-30
Current fill
22.9%vs 7 days ago
-1.0%losing
vs 1 year ago
-32.3%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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.111, -120.787 · Open in Google Maps
About Prineville Reservoir
As of September 30, 2026, Prineville Reservoir is filled to 22.9% of its total capacity, holding roughly 43 hm³ of water out of a maximum 185 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-1.0 pts), and it is 32.3 points below its level on the same date a year earlier.
Across the readings we hold for Prineville Reservoir — 2189 data points between October 3, 2021 and September 30, 2026 — the level has ranged from a low of 9.3% (December 19, 2022) to a high of 100.2% (May 16, 2023). On average the reservoir is fullest around May and at its lowest around November.
It is operated by BOR primarily for multiple purposes. It lies within the Oregon basin at 44.111°N, 120.787°W.
Key facts
- Current fill level
- 22.9%
- Water stored
- 43 hm³
- Total capacity
- 185 hm³
- 7-day change
- ▼ 1.0 pts
- Year-on-year
- ▼ 32.3 pts
- Primary use
- Multipurpose
- River basin
- Oregon
- Operator
- BOR
- Coordinates
- 44.111°N, 120.787°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 22.9% | 42 |
| 29 Sep 2026 | 23.1% | 43 |
| 28 Sep 2026 | 23.2% | 43 |
| 27 Sep 2026 | 23.3% | 43 |
| 26 Sep 2026 | 23.5% | 43 |
| 25 Sep 2026 | 23.6% | 44 |
| 24 Sep 2026 | 23.7% | 44 |
| 23 Sep 2026 | 23.9% | 44 |
| 22 Sep 2026 | 24.0% | 45 |
| 21 Sep 2026 | 24.2% | 45 |
| 20 Sep 2026 | 24.3% | 45 |
| 19 Sep 2026 | 24.5% | 45 |