Reservoir · California · United States · CDEC
SAN LUIS RESERVOIR
69.1% full
Capacity
2,501.93 hm³
Volume stored
1728 hm³
Coordinates
37.033°N, 121.133°W
Last updated
2026-09-17
Current fill
69.1%vs 7 days ago
+2.0%gaining
vs 1 year ago
+21.6%year-over-year
7-day trend
↑rising
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: 2026-09-17.
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 September 17, 2026, SAN LUIS RESERVOIR is filled to 69.1% of its total capacity, holding roughly 1,728 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 risen by 2.0 percentage points, and it is 21.6 points above its level on the same date a year earlier.
Across the readings we hold for SAN LUIS RESERVOIR — 1824 data points between September 19, 2021 and September 17, 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
- 69.1%
- Water stored
- 1,728 hm³
- Total capacity
- 2,502 hm³
- 7-day change
- ▲ 2.0 pts
- Year-on-year
- ▲ 21.6 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 37.033°N, 121.133°W
- Last updated
- September 17, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 17 Sep 2026 | 69.1% | 1,728 |
| 16 Sep 2026 | 68.9% | 1,723 |
| 15 Sep 2026 | 68.8% | 1,721 |
| 14 Sep 2026 | 68.5% | 1,715 |
| 13 Sep 2026 | 68.3% | 1,709 |
| 12 Sep 2026 | 67.9% | 1,699 |
| 11 Sep 2026 | 67.5% | 1,688 |
| 10 Sep 2026 | 67.1% | 1,679 |
| 9 Sep 2026 | 66.8% | 1,670 |
| 8 Sep 2026 | 66.4% | 1,662 |
| 7 Sep 2026 | 66.1% | 1,653 |
| 6 Sep 2026 | 65.7% | 1,643 |