Reservoir · California · United States · CDEC
SWB
100.0% full
Capacity
22.57 hm³
Volume stored
23 hm³
Coordinates
38.200°N, 119.983°W
Last updated
2026-07-08
Current fill
100.0%vs 7 days ago
0.0%stable
vs 1 year ago
-1.1%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: 2026-07-08.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 38.200, -119.983 · Open in Google Maps
About SWB
As of July 8, 2026, SWB is filled to 100.0% of its total capacity, holding roughly 23 hm³ of water out of a maximum 23 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 1.1 points below its level on the same date a year earlier.
Across the readings we hold for SWB — 1825 data points between July 10, 2021 and July 8, 2026 — the level has ranged from a low of 0.1% (May 21, 2024) to a high of 103.7% (May 10, 2026). On average the reservoir is fullest around June and at its lowest around December.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 38.200°N, 119.983°W.
Key facts
- Current fill level
- 100.0%
- Water stored
- 23 hm³
- Total capacity
- 23 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 1.1 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 38.200°N, 119.983°W
- Last updated
- July 8, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 8 Jul 2026 | 100.0% | 23 |
| 7 Jul 2026 | 100.0% | 23 |
| 6 Jul 2026 | 100.2% | 23 |
| 5 Jul 2026 | 100.3% | 23 |
| 4 Jul 2026 | 100.4% | 23 |
| 3 Jul 2026 | 100.6% | 23 |
| 2 Jul 2026 | 100.7% | 23 |
| 1 Jul 2026 | 100.8% | 23 |
| 30 Jun 2026 | 100.9% | 23 |
| 29 Jun 2026 | 101.0% | 23 |
| 28 Jun 2026 | 101.1% | 23 |
| 27 Jun 2026 | 101.2% | 23 |
Frequently asked questions
What is the current water level of SWB?
As of July 8, 2026, SWB is at 100.0% of its capacity, holding approximately 23 hm³ of water, according to CDEC (CA DWR) data.
Is SWB reservoir full?
SWB is essentially full, sitting at 100.0% of capacity as of July 8, 2026.
Is the water level at SWB rising or falling?
The level at SWB has been broadly stable over the latest week on record (0.0 points).
How much water can SWB hold?
SWB has a total capacity of 23 hm³.
Where is SWB reservoir located?
SWB is located in California, United States, within the California basin (coordinates 38.200°N, 119.983°W).
What is SWB used for?
SWB is used primarily for multiple purposes, and is managed by CDEC.