Reservoir · California · United States · CDEC
WARM SPRINGS (LAKE SONOMA)
92.1% full
Capacity
302.2 hm³
Volume stored
278 hm³
Vs month average
125% of normal
Coordinates
38.723°N, 123.010°W
Last updated
2026-11-01
Current fill
92.1%vs 7 days ago
-0.7 pplosing
vs 1 year ago
+1.2 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs November average
125%of normal
92.1% full on 2026-11-01, against an average of 73.7% for November across 6 years of readings (+18.4 points).
Drought Monitor at this site · 27 October 2026
Nonenot in a drought category
WARM SPRINGS (LAKE SONOMA)'s coordinates fall outside every category on the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. California drought figures →
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: 2026-11-01.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 38.723°N, 123.010°W · Open in Google Maps
About WARM SPRINGS (LAKE SONOMA)
As of November 1, 2026, WARM SPRINGS (LAKE SONOMA) is filled to 92.1% of its total capacity, holding 278.41 hm³ of water out of a maximum 302.2 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.7 pp), and it is 1.2 points above its level on the same date a year earlier.
Across the readings we hold for WARM SPRINGS (LAKE SONOMA) — 1302 data points between November 3, 2021 and November 1, 2026 — the level has ranged from a low of 39.3% (December 9, 2022) to a high of 105.0% (June 13, 2024). On average the reservoir is fullest around July and at its lowest around May.
It is operated by CDEC primarily for multiple purposes. It is at 38.723°N, 123.010°W.
Key facts
- Current fill level
- 92.1% of total capacity
- Water stored
- 278.41 hm³
- Total capacity
- 302.2 hm³
- 7-day change
- ▼ 0.7 pp
- Year-on-year
- ▲ 1.2 pp
- Primary use
- Multipurpose
- Operator
- CDEC
- Coordinates
- 38.723°N, 123.010°W
- Last updated
- November 1, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 1 Nov 2026 | 92.1% | 278.41 |
| 31 Oct 2026 | 92.2% | 278.74 |
| 30 Oct 2026 | 92.3% | 279.06 |
| 29 Oct 2026 | 92.4% | 279.37 |
| 28 Oct 2026 | 92.5% | 279.62 |
| 27 Oct 2026 | 92.6% | 279.88 |
| 26 Oct 2026 | 92.7% | 280.15 |
| 25 Oct 2026 | 92.8% | 280.41 |
| 24 Oct 2026 | 92.9% | 280.69 |
| 23 Oct 2026 | 93.0% | 280.97 |
| 22 Oct 2026 | 93.1% | 281.22 |
| 21 Oct 2026 | 93.1% | 281.45 |