Reservoir · California · United States · CDEC
ORO
83.5% full
Capacity
4,366.53 hm³
Volume stored
3644 hm³
Coordinates
39.540°N, 121.493°W
Last updated
2026-07-07
Current fill
83.5%vs 7 days ago
-0.4%losing
vs 1 year ago
-12.0%year-over-year
7-day trend
→stable
Data source: CDEC — California Dept of Water Resources — 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: 2026-07-07.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 39.540, -121.493 · Open in Google Maps
About ORO
As of July 7, 2026, ORO is filled to 83.5% of its total capacity, holding roughly 3,644 hm³ of water out of a maximum 4,367 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.4 pts), and it is 12.0 points below its level on the same date a year earlier.
Across the readings we hold for ORO — 1823 data points between July 10, 2021 and July 7, 2026 — the level has ranged from a low of 22.2% (September 30, 2021) to a high of 99.9% (June 20, 2023). On average the reservoir is fullest around May and at its lowest around November.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 39.540°N, 121.493°W.
Key facts
- Current fill level
- 83.5%
- Water stored
- 3,644 hm³
- Total capacity
- 4,367 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 12.0 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.540°N, 121.493°W
- Last updated
- July 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Jul 2026 | 83.5% | 3,644 |
| 6 Jul 2026 | 83.9% | 3,665 |
| 5 Jul 2026 | 84.6% | 3,696 |
| 4 Jul 2026 | 85.0% | 3,713 |
| 3 Jul 2026 | 85.4% | 3,729 |
| 2 Jul 2026 | 86.1% | 3,758 |
| 1 Jul 2026 | 86.7% | 3,786 |
| 30 Jun 2026 | 87.1% | 3,802 |
| 29 Jun 2026 | 87.5% | 3,820 |
| 28 Jun 2026 | 87.8% | 3,835 |
| 27 Jun 2026 | 88.2% | 3,849 |
| 26 Jun 2026 | 88.6% | 3,867 |
Frequently asked questions
What is the current water level of ORO?
As of July 7, 2026, ORO is at 83.5% of its capacity, holding approximately 3,644 hm³ of water, according to CDEC (CA DWR) data.
Is ORO reservoir full?
No. As of July 7, 2026, ORO is high at 83.5% of its capacity, so it is not full.
Is the water level at ORO rising or falling?
The level at ORO has been broadly stable over the latest week on record (-0.4 points).
How much water can ORO hold?
ORO has a total capacity of 4,367 hm³.
Where is ORO reservoir located?
ORO is located in California, United States, within the California basin (coordinates 39.540°N, 121.493°W).
What is ORO used for?
ORO is used primarily for multiple purposes, and is managed by CDEC.