Reservoir · California · United States · CDEC
WISHON
82.6% full
Capacity
159.26 hm³
Volume stored
132 hm³
Vs month average
126% of normal
Coordinates
37.005°N, 118.969°W
Last updated
2026-10-07
Current fill
82.6%vs 7 days ago
-4.1%losing
vs 1 year ago
+16.6%year-over-year
7-day trend
↓falling
Drought context
Storage vs October average
126%of normal
82.6% full on 2026-10-07, against an average of 65.5% for October across 6 years of readings (+17.1 points).
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: 2026-10-07.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 37.005, -118.969 · Open in Google Maps
About WISHON
As of October 7, 2026, WISHON is filled to 82.6% of its total capacity, holding roughly 132 hm³ of water out of a maximum 159 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 4.1 percentage points, and it is 16.6 points above its level on the same date a year earlier.
Across the readings we hold for WISHON — 1817 data points between October 16, 2021 and October 7, 2026 — the level has ranged from a low of 26.7% (November 25, 2021) to a high of 96.6% (May 28, 2026). On average the reservoir is fullest around September and at its lowest around December.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 37.005°N, 118.969°W.
Key facts
- Current fill level
- 82.6%
- Water stored
- 132 hm³
- Total capacity
- 159 hm³
- 7-day change
- ▼ 4.1 pts
- Year-on-year
- ▲ 16.6 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 37.005°N, 118.969°W
- Last updated
- October 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Oct 2026 | 82.6% | 132 |
| 6 Oct 2026 | 82.3% | 131 |
| 5 Oct 2026 | 82.5% | 131 |
| 4 Oct 2026 | 82.9% | 132 |
| 3 Oct 2026 | 83.8% | 134 |
| 2 Oct 2026 | 84.4% | 134 |
| 1 Oct 2026 | 85.2% | 136 |
| 30 Sep 2026 | 86.7% | 138 |
| 29 Sep 2026 | 86.3% | 138 |
| 28 Sep 2026 | 86.8% | 138 |
| 27 Sep 2026 | 86.6% | 138 |
| 26 Sep 2026 | 85.5% | 136 |