Reservoir · California · United States · CDEC
San Luis Reservoir
56.7% full
Capacity
2,501.93 hm³
Volume stored
1418 hm³
Coordinates
37.033°N, 121.133°W
Last updated
2026-08-03
Current fill
56.7%vs 7 days ago
+0.6%gaining
vs 1 year ago
+18.3%year-over-year
7-day trend
→stable
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: 2026-08-03.
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 August 3, 2026, San Luis Reservoir is filled to 56.7% of its total capacity, holding roughly 1,418 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 (+0.6 pts), and it is 18.3 points above its level on the same date a year earlier.
Across the readings we hold for San Luis Reservoir — 1824 data points between August 5, 2021 and August 3, 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
- 56.7%
- Water stored
- 1,418 hm³
- Total capacity
- 2,502 hm³
- 7-day change
- ▲ 0.6 pts
- Year-on-year
- ▲ 18.3 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 37.033°N, 121.133°W
- Last updated
- August 3, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 3 Aug 2026 | 56.7% | 1,418 |
| 2 Aug 2026 | 56.7% | 1,418 |
| 1 Aug 2026 | 56.4% | 1,411 |
| 31 Jul 2026 | 56.3% | 1,409 |
| 30 Jul 2026 | 56.2% | 1,405 |
| 29 Jul 2026 | 56.1% | 1,403 |
| 28 Jul 2026 | 56.1% | 1,403 |
| 27 Jul 2026 | 56.1% | 1,405 |
| 26 Jul 2026 | 56.2% | 1,406 |
| 25 Jul 2026 | 56.2% | 1,406 |
| 24 Jul 2026 | 56.2% | 1,405 |
| 23 Jul 2026 | 56.2% | 1,406 |
Frequently asked questions
What is the current water level of San Luis Reservoir?
As of August 3, 2026, San Luis Reservoir is at 56.7% of its capacity, holding approximately 1,418 hm³ of water, according to CDEC (CA DWR) data.
Is San Luis Reservoir reservoir full?
No. As of August 3, 2026, San Luis Reservoir is within its normal operating range at 56.7% of its capacity, so it is not full.
Is the water level at San Luis Reservoir rising or falling?
The level at San Luis Reservoir has been broadly stable over the latest week on record (+0.6 points).
How much water can San Luis Reservoir hold?
San Luis Reservoir has a total capacity of 2,502 hm³.
Where is San Luis Reservoir reservoir located?
San Luis Reservoir is located in California, United States, within the California basin (coordinates 37.033°N, 121.133°W).
What is San Luis Reservoir used for?
San Luis Reservoir is used primarily for multiple purposes, and is managed by CDEC.