Reservoir · Oregon · United States · BOR RISE
Lake Owyhee
Lake Owyhee and Owyhee Dam
8.3% full
Capacity
1,381.5 hm³
Volume stored
115 hm³
Coordinates
43.642°N, 117.243°W
Last updated
2026-09-30
Current fill
8.3%vs 7 days ago
-0.9%losing
vs 1 year ago
-24.7%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: 2026-09-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 43.642, -117.243 · Open in Google Maps
About Lake Owyhee
As of September 30, 2026, Lake Owyhee is filled to 8.3% of its total capacity, holding roughly 115 hm³ of water out of a maximum 1,382 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has held broadly steady (-0.9 pts), and it is 24.7 points below its level on the same date a year earlier.
Across the readings we hold for Lake Owyhee — 2184 data points between October 2, 2021 and September 30, 2026 — the level has ranged from a low of 4.5% (October 6, 2022) to a high of 63.9% (May 28, 2024). On average the reservoir is fullest around May and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Oregon basin at 43.642°N, 117.243°W.
Key facts
- Current fill level
- 8.3%
- Water stored
- 115 hm³
- Total capacity
- 1,382 hm³
- 7-day change
- ▼ 0.9 pts
- Year-on-year
- ▼ 24.7 pts
- Primary use
- Multipurpose
- River basin
- Oregon
- Operator
- BOR
- Coordinates
- 43.642°N, 117.243°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 8.3% | 115 |
| 29 Sep 2026 | 8.4% | 117 |
| 28 Sep 2026 | 8.5% | 118 |
| 27 Sep 2026 | 8.6% | 119 |
| 26 Sep 2026 | 8.8% | 121 |
| 25 Sep 2026 | 8.9% | 123 |
| 24 Sep 2026 | 9.0% | 125 |
| 23 Sep 2026 | 9.2% | 126 |
| 22 Sep 2026 | 9.3% | 128 |
| 21 Sep 2026 | 9.4% | 130 |
| 20 Sep 2026 | 9.5% | 132 |
| 19 Sep 2026 | 9.7% | 133 |