Reservoir · California · United States · CDEC
Lake Berryessa
88.1% full
Capacity
1,976.38 hm³
Volume stored
1741 hm³
Coordinates
38.513°N, 122.104°W
Last updated
2026-08-02
Current fill
88.1%vs 7 days ago
-0.6%losing
vs 1 year ago
-1.2%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: 2026-08-02.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 38.513, -122.104 · Open in Google Maps
About Lake Berryessa
As of August 2, 2026, Lake Berryessa is filled to 88.1% of its total capacity, holding roughly 1,741 hm³ of water out of a maximum 1,976 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.6 pts), and it is 1.2 points below its level on the same date a year earlier.
Across the readings we hold for Lake Berryessa — 1824 data points between August 5, 2021 and August 2, 2026 — the level has ranged from a low of 49.3% (November 28, 2022) to a high of 100.3% (February 14, 2025). On average the reservoir is fullest around April and at its lowest around October.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 38.513°N, 122.104°W.
Key facts
- Current fill level
- 88.1%
- Water stored
- 1,741 hm³
- Total capacity
- 1,976 hm³
- 7-day change
- ▼ 0.6 pts
- Year-on-year
- ▼ 1.2 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 38.513°N, 122.104°W
- Last updated
- August 2, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 2 Aug 2026 | 88.1% | 1,741 |
| 1 Aug 2026 | 88.2% | 1,743 |
| 31 Jul 2026 | 88.3% | 1,744 |
| 30 Jul 2026 | 88.4% | 1,746 |
| 29 Jul 2026 | 88.4% | 1,748 |
| 28 Jul 2026 | 88.5% | 1,750 |
| 27 Jul 2026 | 88.6% | 1,752 |
| 26 Jul 2026 | 88.7% | 1,753 |
| 25 Jul 2026 | 88.8% | 1,755 |
| 24 Jul 2026 | 88.9% | 1,757 |
| 23 Jul 2026 | 89.0% | 1,759 |
| 22 Jul 2026 | 89.1% | 1,760 |
Frequently asked questions
What is the current water level of Lake Berryessa?
As of August 2, 2026, Lake Berryessa is at 88.1% of its capacity, holding approximately 1,741 hm³ of water, according to CDEC (CA DWR) data.
Is Lake Berryessa reservoir full?
No. As of August 2, 2026, Lake Berryessa is high at 88.1% of its capacity, so it is not full.
Is the water level at Lake Berryessa rising or falling?
The level at Lake Berryessa has been broadly stable over the latest week on record (-0.6 points).
How much water can Lake Berryessa hold?
Lake Berryessa has a total capacity of 1,976 hm³.
Where is Lake Berryessa reservoir located?
Lake Berryessa is located in California, United States, within the California basin (coordinates 38.513°N, 122.104°W).
What is Lake Berryessa used for?
Lake Berryessa is used primarily for multiple purposes, and is managed by CDEC.