Reservoir · California · United States · CDEC
SLY CREEK
35.4% full
Capacity
80.24 hm³
Volume stored
28 hm³
Vs month average
66% of normal
Coordinates
39.584°N, 121.116°W
Last updated
2026-10-13
Current fill
35.4%vs 7 days ago
+5.7%gaining
vs 1 year ago
-26.2%year-over-year
7-day trend
↑rising
Drought context
Storage vs October average
66%of normal
35.4% full on 2026-10-13, against an average of 54.0% for October across 6 years of readings (-18.6 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. 39.584, -121.116 · Open in Google Maps
About SLY CREEK
As of October 13, 2026, SLY CREEK is filled to 35.4% of its total capacity, holding roughly 28 hm³ of water out of a maximum 80 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has risen by 5.7 percentage points, and it is 26.2 points below its level on the same date a year earlier.
Across the readings we hold for SLY CREEK — 1824 data points between October 16, 2021 and October 13, 2026 — the level has ranged from a low of 20.9% (October 22, 2021) to a high of 96.8% (April 22, 2022). On average the reservoir is fullest around May and at its lowest around September.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 39.584°N, 121.116°W.
Key facts
- Current fill level
- 35.4%
- Water stored
- 28 hm³
- Total capacity
- 80 hm³
- 7-day change
- ▲ 5.7 pts
- Year-on-year
- ▼ 26.2 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.584°N, 121.116°W
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 35.4% | 28 |
| 12 Oct 2026 | 34.7% | 28 |
| 11 Oct 2026 | 33.8% | 27 |
| 10 Oct 2026 | 33.0% | 26 |
| 9 Oct 2026 | 32.0% | 26 |
| 8 Oct 2026 | 31.2% | 25 |
| 7 Oct 2026 | 30.4% | 24 |
| 6 Oct 2026 | 29.7% | 24 |
| 5 Oct 2026 | 29.1% | 23 |
| 4 Oct 2026 | 28.6% | 23 |
| 3 Oct 2026 | 28.0% | 22 |
| 2 Oct 2026 | 27.5% | 22 |