Reservoir · California · United States · CDEC
BLACK BUTTE
19.4% full
Capacity
130.63 hm³
Volume stored
25 hm³
Vs month average
60% of normal
Coordinates
39.808°N, 122.329°W
Last updated
2026-10-14
Current fill
19.4%vs 7 days ago
-3.3%losing
vs 1 year ago
-19.7%year-over-year
7-day trend
↓falling
Drought context
Storage vs October average
60%of normal
19.4% full on 2026-10-14, against an average of 32.6% for October across 6 years of readings (-13.2 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: 2026-10-14.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 39.808, -122.329 · Open in Google Maps
About BLACK BUTTE
As of October 14, 2026, BLACK BUTTE is filled to 19.4% of its total capacity, holding roughly 25 hm³ of water out of a maximum 131 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has fallen by 3.3 percentage points, and it is 19.7 points below its level on the same date a year earlier.
Across the readings we hold for BLACK BUTTE — 1824 data points between October 16, 2021 and October 14, 2026 — the level has ranged from a low of 16.8% (October 16, 2021) to a high of 105.0% (April 25, 2023). On average the reservoir is fullest around May and at its lowest around October.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 39.808°N, 122.329°W.
Key facts
- Current fill level
- 19.4%
- Water stored
- 25 hm³
- Total capacity
- 131 hm³
- 7-day change
- ▼ 3.3 pts
- Year-on-year
- ▼ 19.7 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.808°N, 122.329°W
- Last updated
- October 14, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 14 Oct 2026 | 19.4% | 25 |
| 13 Oct 2026 | 19.9% | 26 |
| 12 Oct 2026 | 20.6% | 27 |
| 11 Oct 2026 | 21.2% | 28 |
| 10 Oct 2026 | 21.4% | 28 |
| 9 Oct 2026 | 21.7% | 28 |
| 8 Oct 2026 | 22.1% | 29 |
| 7 Oct 2026 | 22.7% | 30 |
| 6 Oct 2026 | 23.5% | 31 |
| 5 Oct 2026 | 24.2% | 32 |
| 4 Oct 2026 | 24.8% | 32 |
| 3 Oct 2026 | 24.9% | 33 |