Reservoir · California · United States · CDEC
ISABELLA DAM
27.8% full
Capacity
700.62 hm³
Volume stored
195 hm³
Coordinates
35.646°N, 118.473°W
Last updated
2026-09-17
Current fill
27.8%vs 7 days ago
-1.1%losing
vs 1 year ago
-12.1%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: 2026-09-17.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 35.646, -118.473 · Open in Google Maps
About ISABELLA DAM
As of September 17, 2026, ISABELLA DAM is filled to 27.8% of its total capacity, holding roughly 195 hm³ of water out of a maximum 701 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (-1.1 pts), and it is 12.1 points below its level on the same date a year earlier.
Across the readings we hold for ISABELLA DAM — 1824 data points between September 19, 2021 and September 17, 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 lies within the California basin at 35.646°N, 118.473°W.
Key facts
- Current fill level
- 27.8%
- Water stored
- 195 hm³
- Total capacity
- 701 hm³
- 7-day change
- ▼ 1.1 pts
- Year-on-year
- ▼ 12.1 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 35.646°N, 118.473°W
- Last updated
- September 17, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 17 Sep 2026 | 27.8% | 195 |
| 16 Sep 2026 | 27.9% | 196 |
| 15 Sep 2026 | 28.1% | 197 |
| 14 Sep 2026 | 28.2% | 198 |
| 13 Sep 2026 | 28.4% | 199 |
| 12 Sep 2026 | 28.6% | 200 |
| 11 Sep 2026 | 28.7% | 201 |
| 10 Sep 2026 | 28.9% | 202 |
| 9 Sep 2026 | 29.1% | 204 |
| 8 Sep 2026 | 29.2% | 205 |
| 7 Sep 2026 | 29.4% | 206 |
| 6 Sep 2026 | 29.5% | 207 |