Reservoir · California · United States · CDEC
ISABELLA DAM
61.8% full
Capacity
700.62 hm³
Volume stored
433 hm³
Coordinates
35.646°N, 118.473°W
Last updated
2026-06-11
Current fill
61.8%vs 7 days ago
-0.3%losing
vs 1 year ago
-2.1%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: 2026-06-11.
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 June 11, 2026, ISABELLA DAM is filled to 61.8% of its total capacity, holding roughly 433 hm³ of water out of a maximum 701 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.3 pts), and it is 2.1 points below its level on the same date a year earlier.
Across the readings we hold for ISABELLA DAM — 1824 data points between June 13, 2021 and June 11, 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 May 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
- 61.8%
- Water stored
- 433 hm³
- Total capacity
- 701 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▼ 2.1 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 35.646°N, 118.473°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 61.8% | 433 |
| 10 Jun 2026 | 62.1% | 435 |
| 9 Jun 2026 | 62.3% | 436 |
| 8 Jun 2026 | 62.5% | 438 |
| 7 Jun 2026 | 62.8% | 440 |
| 6 Jun 2026 | 63.0% | 441 |
| 5 Jun 2026 | 63.1% | 442 |
| 4 Jun 2026 | 63.3% | 443 |
| 3 Jun 2026 | 63.5% | 445 |
| 2 Jun 2026 | 63.8% | 447 |
| 1 Jun 2026 | 64.0% | 449 |
| 31 May 2026 | 64.3% | 450 |
Frequently asked questions
What is the current water level of ISABELLA DAM?
As of June 11, 2026, ISABELLA DAM is at 61.8% of its capacity, holding approximately 433 hm³ of water, according to CDEC (CA DWR) data.
Is ISABELLA DAM reservoir full?
No. As of June 11, 2026, ISABELLA DAM is within its normal operating range at 61.8% of its capacity, so it is not full.
Is the water level at ISABELLA DAM rising or falling?
The level at ISABELLA DAM has been broadly stable over the latest week on record (-0.3 points).
How much water can ISABELLA DAM hold?
ISABELLA DAM has a total capacity of 701 hm³.
Where is ISABELLA DAM reservoir located?
ISABELLA DAM is located in California, United States, within the California basin (coordinates 35.646°N, 118.473°W).
What is ISABELLA DAM used for?
ISABELLA DAM is used primarily for multiple purposes, and is managed by CDEC.