Reservoir · California · United States · CDEC
CASTAIC
86.5% full
Capacity
399.28 hm³
Volume stored
346 hm³
Vs month average
114% of normal
Coordinates
34.515°N, 118.610°W
Last updated
2026-10-29
Current fill
86.5%vs 7 days ago
-2.7 pplosing
vs 1 year ago
+2.2 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
114%of normal
86.5% full on 2026-10-29, against an average of 76.0% for October across 6 years of readings (+10.5 points).
Drought Monitor at this site · 27 October 2026
Nonenot in a drought category
CASTAIC'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: 2026-10-29.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 34.515°N, 118.610°W · Open in Google Maps
About CASTAIC
As of October 29, 2026, CASTAIC is filled to 86.5% of its total capacity, holding 345.5 hm³ of water out of a maximum 399.28 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 2.7 percentage points, and it is 2.2 points above its level on the same date a year earlier.
Across the readings we hold for CASTAIC — 1823 data points between October 31, 2021 and October 29, 2026 — the level has ranged from a low of 28.4% (November 3, 2021) to a high of 100.2% (July 12, 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 34.515°N, 118.610°W.
Key facts
- Current fill level
- 86.5% of total capacity
- Water stored
- 345.5 hm³
- Total capacity
- 399.28 hm³
- 7-day change
- ▼ 2.7 pp
- Year-on-year
- ▲ 2.2 pp
- Primary use
- Multipurpose
- Operator
- CDEC
- Coordinates
- 34.515°N, 118.610°W
- Last updated
- October 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Oct 2026 | 86.5% | 345.5 |
| 28 Oct 2026 | 86.9% | 346.92 |
| 27 Oct 2026 | 87.3% | 348.49 |
| 26 Oct 2026 | 87.7% | 350.25 |
| 25 Oct 2026 | 88.1% | 351.81 |
| 24 Oct 2026 | 88.5% | 353.19 |
| 23 Oct 2026 | 88.8% | 354.61 |
| 22 Oct 2026 | 89.2% | 356.1 |
| 21 Oct 2026 | 89.5% | 357.23 |
| 20 Oct 2026 | 89.8% | 358.73 |
| 19 Oct 2026 | 90.3% | 360.49 |
| 18 Oct 2026 | 90.9% | 363.04 |