Reservoir · California · United States · CDEC
SAN LUIS RESERVOIR
72.2% full
Capacity
2,501.93 hm³
Volume stored
1807 hm³
Vs month average
146% of normal
Coordinates
37.033°N, 121.133°W
Last updated
2026-10-14
Current fill
72.2%vs 7 days ago
-1.3%losing
vs 1 year ago
+18.6%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
146%of normal
72.2% full on 2026-10-14, against an average of 49.5% for October across 6 years of readings (+22.7 points).
Drought Monitor at this site · 13 October 2026
Nonenot in a drought category
SAN LUIS RESERVOIR's coordinates fall outside every category on the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. California drought figures →
Data source: CDEC — California Dept of Water Resources — daily reservoir storage volume. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. 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. 37.033, -121.133 · Open in Google Maps
About SAN LUIS RESERVOIR
As of October 14, 2026, SAN LUIS RESERVOIR is filled to 72.2% of its total capacity, holding roughly 1,807 hm³ of water out of a maximum 2,502 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-1.3 pts), and it is 18.6 points above its level on the same date a year earlier.
Across the readings we hold for SAN LUIS RESERVOIR — 1824 data points between October 16, 2021 and October 14, 2026 — the level has ranged from a low of 9.5% (October 22, 2021) to a high of 100.0% (April 6, 2023). On average the reservoir is fullest around April and at its lowest around November.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 37.033°N, 121.133°W.
Key facts
- Current fill level
- 72.2%
- Water stored
- 1,807 hm³
- Total capacity
- 2,502 hm³
- 7-day change
- ▼ 1.3 pts
- Year-on-year
- ▲ 18.6 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 37.033°N, 121.133°W
- Last updated
- October 14, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 14 Oct 2026 | 72.2% | 1,807 |
| 13 Oct 2026 | 72.5% | 1,813 |
| 12 Oct 2026 | 72.8% | 1,822 |
| 11 Oct 2026 | 73.2% | 1,830 |
| 10 Oct 2026 | 73.3% | 1,834 |
| 9 Oct 2026 | 73.5% | 1,838 |
| 8 Oct 2026 | 73.5% | 1,839 |
| 7 Oct 2026 | 73.5% | 1,839 |
| 6 Oct 2026 | 73.3% | 1,833 |
| 5 Oct 2026 | 73.1% | 1,830 |
| 4 Oct 2026 | 73.0% | 1,827 |
| 3 Oct 2026 | 72.8% | 1,821 |