Reservoir · California · United States · CDEC
HETCH HETCHY
76.7% full
Capacity
444.05 hm³
Volume stored
341 hm³
Vs month average
98% of normal
Coordinates
37.950°N, 119.783°W
Last updated
2026-10-13
Current fill
76.7%vs 7 days ago
-1.6%losing
vs 1 year ago
+0.5%year-over-year
7-day trend
↓falling
Drought context
Storage vs October average
98%of normal
76.7% full on 2026-10-13, against an average of 78.2% for October across 6 years of readings (-1.5 points).
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: 2026-10-13.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 37.950, -119.783 · Open in Google Maps
About HETCH HETCHY
As of October 13, 2026, HETCH HETCHY is filled to 76.7% of its total capacity, holding roughly 341 hm³ of water out of a maximum 444 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 1.6 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for HETCH HETCHY — 1824 data points between October 16, 2021 and October 13, 2026 — the level has ranged from a low of 60.8% (April 22, 2023) to a high of 100.9% (July 20, 2023). On average the reservoir is fullest around July and at its lowest around December.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 37.950°N, 119.783°W.
Key facts
- Current fill level
- 76.7%
- Water stored
- 341 hm³
- Total capacity
- 444 hm³
- 7-day change
- ▼ 1.6 pts
- Year-on-year
- ▲ 0.5 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 37.950°N, 119.783°W
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 76.7% | 341 |
| 12 Oct 2026 | 76.9% | 342 |
| 11 Oct 2026 | 77.2% | 343 |
| 10 Oct 2026 | 77.4% | 344 |
| 9 Oct 2026 | 77.6% | 345 |
| 8 Oct 2026 | 77.9% | 346 |
| 7 Oct 2026 | 78.1% | 347 |
| 6 Oct 2026 | 78.3% | 348 |
| 5 Oct 2026 | 78.5% | 348 |
| 4 Oct 2026 | 78.7% | 349 |
| 3 Oct 2026 | 78.9% | 350 |
| 2 Oct 2026 | 79.1% | 351 |