Reservoir · California · United States · CDEC
BOCA RESERVOIR
41.3% full
Capacity
40.54 hm³
Volume stored
17 hm³
Vs month average
78% of normal
Coordinates
39.388°N, 120.095°W
Last updated
2026-10-13
Current fill
41.3%vs 7 days ago
-6.3%losing
vs 1 year ago
-26.0%year-over-year
7-day trend
↓falling
Drought context
Storage vs October average
78%of normal
41.3% full on 2026-10-13, against an average of 52.9% for October across 6 years of readings (-11.6 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. 39.388, -120.095 · Open in Google Maps
About BOCA RESERVOIR
As of October 13, 2026, BOCA RESERVOIR is filled to 41.3% of its total capacity, holding roughly 17 hm³ of water out of a maximum 41 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 6.3 percentage points, and it is 26.0 points below its level on the same date a year earlier.
Across the readings we hold for BOCA RESERVOIR — 1821 data points between October 16, 2021 and October 13, 2026 — the level has ranged from a low of 11.7% (November 30, 2022) to a high of 105.0% (June 8, 2022). 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 39.388°N, 120.095°W.
Key facts
- Current fill level
- 41.3%
- Water stored
- 17 hm³
- Total capacity
- 41 hm³
- 7-day change
- ▼ 6.3 pts
- Year-on-year
- ▼ 26.0 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.388°N, 120.095°W
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 41.3% | 17 |
| 12 Oct 2026 | 42.1% | 17 |
| 11 Oct 2026 | 42.9% | 17 |
| 10 Oct 2026 | 43.7% | 18 |
| 9 Oct 2026 | 44.7% | 18 |
| 8 Oct 2026 | 45.7% | 19 |
| 7 Oct 2026 | 46.6% | 19 |
| 6 Oct 2026 | 47.6% | 19 |
| 5 Oct 2026 | 48.6% | 20 |
| 4 Oct 2026 | 49.6% | 20 |
| 3 Oct 2026 | 50.6% | 21 |
| 2 Oct 2026 | 51.6% | 21 |