Reservoir · California · United States · CDEC
HHL
84.9% full
Capacity
255.33 hm³
Volume stored
217 hm³
Coordinates
39.058°N, 120.407°W
Last updated
2026-07-07
Current fill
84.9%vs 7 days ago
-0.4%losing
vs 1 year ago
-12.0%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: 2026-07-07.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 39.058, -120.407 · Open in Google Maps
About HHL
As of July 7, 2026, HHL is filled to 84.9% of its total capacity, holding roughly 217 hm³ of water out of a maximum 255 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.4 pts), and it is 12.0 points below its level on the same date a year earlier.
Across the readings we hold for HHL — 1821 data points between July 10, 2021 and July 7, 2026 — the level has ranged from a low of 26.4% (October 16, 2021) to a high of 101.3% (May 21, 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 39.058°N, 120.407°W.
Key facts
- Current fill level
- 84.9%
- Water stored
- 217 hm³
- Total capacity
- 255 hm³
- 7-day change
- ▼ 0.4 pts
- Year-on-year
- ▼ 12.0 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.058°N, 120.407°W
- Last updated
- July 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Jul 2026 | 84.9% | 217 |
| 6 Jul 2026 | 85.3% | 218 |
| 5 Jul 2026 | 85.8% | 219 |
| 4 Jul 2026 | 86.2% | 220 |
| 3 Jul 2026 | 86.8% | 222 |
| 2 Jul 2026 | 87.3% | 223 |
| 1 Jul 2026 | 87.6% | 224 |
| 30 Jun 2026 | 87.9% | 224 |
| 29 Jun 2026 | 88.1% | 225 |
| 28 Jun 2026 | 88.5% | 226 |
| 27 Jun 2026 | 88.8% | 227 |
| 26 Jun 2026 | 89.0% | 227 |
Frequently asked questions
What is the current water level of HHL?
As of July 7, 2026, HHL is at 84.9% of its capacity, holding approximately 217 hm³ of water, according to CDEC (CA DWR) data.
Is HHL reservoir full?
No. As of July 7, 2026, HHL is high at 84.9% of its capacity, so it is not full.
Is the water level at HHL rising or falling?
The level at HHL has been broadly stable over the latest week on record (-0.4 points).
How much water can HHL hold?
HHL has a total capacity of 255 hm³.
Where is HHL reservoir located?
HHL is located in California, United States, within the California basin (coordinates 39.058°N, 120.407°W).
What is HHL used for?
HHL is used primarily for multiple purposes, and is managed by CDEC.