Reservoir · California · United States · CDEC
ISABELLA DAM
24.5% full
Capacity
700.62 hm³
Volume stored
172 hm³
Vs month average
108% of normal
Coordinates
35.646°N, 118.473°W
Last updated
2026-11-01
Current fill
24.5%vs 7 days ago
-0.1 pplosing
vs 1 year ago
-8.3 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs November average
108%of normal
24.5% full on 2026-11-01, against an average of 22.7% for November across 6 years of readings (+1.8 points).
Drought Monitor at this site · 27 October 2026
D0abnormally dry
The ground at ISABELLA DAM's coordinates falls inside the D0 area of 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. 35.646°N, 118.473°W · Open in Google Maps
About ISABELLA DAM
As of November 1, 2026, ISABELLA DAM is filled to 24.5% of its total capacity, holding 171.66 hm³ of water out of a maximum 700.62 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-0.1 pp), and it is 8.3 points below its level on the same date a year earlier.
Across the readings we hold for ISABELLA DAM — 1824 data points between November 3, 2021 and November 1, 2026 — the level has ranged from a low of 6.4% (October 27, 2022) to a high of 96.8% (July 23, 2023). On average the reservoir is fullest around June and at its lowest around December.
It is operated by CDEC primarily for multiple purposes. It is at 35.646°N, 118.473°W.
Key facts
- Current fill level
- 24.5% of total capacity
- Water stored
- 171.66 hm³
- Total capacity
- 700.62 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- ▼ 8.3 pp
- Primary use
- Multipurpose
- Operator
- CDEC
- Coordinates
- 35.646°N, 118.473°W
- Last updated
- November 1, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 1 Nov 2026 | 24.5% | 171.66 |
| 31 Oct 2026 | 24.5% | 171.46 |
| 30 Oct 2026 | 24.5% | 171.4 |
| 29 Oct 2026 | 24.5% | 171.46 |
| 28 Oct 2026 | 24.5% | 171.66 |
| 27 Oct 2026 | 24.5% | 171.72 |
| 26 Oct 2026 | 24.5% | 171.92 |
| 25 Oct 2026 | 24.6% | 172.18 |
| 24 Oct 2026 | 24.6% | 172.31 |
| 23 Oct 2026 | 24.6% | 172.44 |
| 22 Oct 2026 | 24.6% | 172.44 |
| 21 Oct 2026 | 24.6% | 172.7 |