Reservoir · California · United States · CDEC
DONNELLS
51.8% full
Capacity
79.56 hm³
Volume stored
41 hm³
Coordinates
38.329°N, 119.960°W
Last updated
2026-09-17
Current fill
51.8%vs 7 days ago
-9.2%losing
vs 1 year ago
+4.5%year-over-year
7-day trend
↓falling
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. 38.329, -119.960 · Open in Google Maps
About DONNELLS
As of September 17, 2026, DONNELLS is filled to 51.8% of its total capacity, holding roughly 41 hm³ of water out of a maximum 80 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 9.2 percentage points, and it is 4.5 points above its level on the same date a year earlier.
Across the readings we hold for DONNELLS — 1825 data points between September 19, 2021 and September 17, 2026 — the level has ranged from a low of 13.8% (March 6, 2024) to a high of 105.0% (May 3, 2024). On average the reservoir is fullest around June and at its lowest around February.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 38.329°N, 119.960°W.
Key facts
- Current fill level
- 51.8%
- Water stored
- 41 hm³
- Total capacity
- 80 hm³
- 7-day change
- ▼ 9.2 pts
- Year-on-year
- ▲ 4.5 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 38.329°N, 119.960°W
- Last updated
- September 17, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 17 Sep 2026 | 51.8% | 41 |
| 16 Sep 2026 | 52.7% | 42 |
| 15 Sep 2026 | 53.8% | 43 |
| 14 Sep 2026 | 54.9% | 44 |
| 13 Sep 2026 | 56.6% | 45 |
| 12 Sep 2026 | 57.7% | 46 |
| 11 Sep 2026 | 59.3% | 47 |
| 10 Sep 2026 | 61.0% | 49 |
| 9 Sep 2026 | 62.3% | 50 |
| 8 Sep 2026 | 64.0% | 51 |
| 7 Sep 2026 | 64.7% | 52 |
| 6 Sep 2026 | 65.1% | 52 |