B.F. Sisk Dam · San Luis Creek (offstream) · California — updated daily from official gauges
Latest reading
San Luis Reservoir is 55.9% full as of — surface elevation 466.49 feet, storage 1,140,235 acre-feet (capacity basis 2,041,000 acre-feet).
That elevation is its highest July reading since 2023, and 121.53 feet above its record low of 344.96 ft (), in a daily record going back to January 4, 1988 (start of CDEC's daily record).
Storage is 124% of the July 23 average across 39 years of record.
Water level change: -0.34 ft over the past week, -12.56 ft over the past month, and +36.43 ft over the past year.
Percent full
55.9%
of 2,041,000 AF
Vs date average
124%
of the Jul 23 storage average since 1988
Elevation
466.49 ft
full pool 544.0 ft
Storage
1,140,235 AF
+359 KAF vs 1 yr ago
1-week change
-0.34 ft
elevation
1-year change
+36.43 ft
elevation
San Luis Reservoir vs its record low
In the daily record used by this site (going back to January 4, 1988 (start of CDEC's daily record)), San Luis Reservoir's lowest surface elevation was 344.96 feet on , when storage was 160,927 acre-feet. As of , San Luis Reservoir is at 466.49 feet — 121.53 feet above that record. The record high in the same series was 544.17 ft on .
San Luis Reservoir storage in context
Reading
Elevation (ft)
Storage (AF)
% full
Today (July 23, 2026)
466.49
1,140,235
55.9%
One year ago
430.06
781,486
38.3%
Five years ago
393.97
475,788
23.3%
Record low (August 24, 1989)
344.96
160,927
7.9%
Capacity basis
544.00
2,041,000
100.0%
San Luis Reservoir water level, past 12 months
San Luis Reservoir daily surface elevation (feet above sea level), past 12 months. Source: California DWR CDEC. Rendered at build time from the official gauge record — no JavaScript.
San Luis Reservoir elevation, full record
San Luis Reservoir month-end surface elevation, 1988–2026 — the full daily record fetched from California DWR CDEC, one point per month.
Last 14 daily readings
Date
Elevation (ft)
Day change
Storage (AF)
July 23, 2026
466.49
+0.09 ft
1,140,235
July 22, 2026
466.40
+0.10 ft
1,139,294
July 21, 2026
466.30
-0.17 ft
1,138,250
July 20, 2026
466.47
+0.03 ft
1,140,026
July 19, 2026
466.44
-0.04 ft
1,139,712
July 18, 2026
466.48
-0.11 ft
1,140,130
July 17, 2026
466.59
-0.24 ft
1,141,280
July 16, 2026
466.83
-0.19 ft
1,143,789
July 15, 2026
467.02
-0.29 ft
1,145,777
July 14, 2026
467.31
-0.29 ft
1,148,813
July 13, 2026
467.60
-0.13 ft
1,151,852
July 12, 2026
467.73
-0.12 ft
1,153,215
July 11, 2026
467.85
-0.30 ft
1,154,474
July 10, 2026
468.15
—
1,157,622
Frequently asked questions
What is the water level of San Luis Reservoir today?
As of July 23, 2026, San Luis Reservoir's surface elevation is 466.49 feet, with 1,140,235 acre-feet in storage — 55.9% of the 2,041,000 acre-foot capacity basis. Source: California DWR CDEC daily gauge data.
How full is San Luis Reservoir?
San Luis Reservoir is 55.9% full as of July 23, 2026. Its storage is 124% of the July 23 average across its record since 1988.
Is San Luis Reservoir rising or falling?
San Luis Reservoir is falling: its elevation changed -0.34 feet over the week ending July 23, 2026, -12.56 ft over the past month, and +36.43 feet over the past year. Source: California DWR CDEC daily gauge data.
What was San Luis Reservoir's lowest water level on record?
San Luis Reservoir's lowest surface elevation in the daily record since January 4, 1988 was 344.96 feet on August 24, 1989, per the daily record used by this site. As of July 23, 2026 the reservoir is 121.53 feet above that record low.
About this gauge
San Luis Reservoir near Los Banos is the largest offstream reservoir in the United States, shared by the federal Central Valley Project and the State Water Project. It is filled by pumping in the wet season and drawn down through summer, so large seasonal swings are normal.
Data: California DWR CDEC station SNL, daily reservoir elevation (sensor 6) and storage (sensor 15). Percent full uses the 2,041,000 acre-foot capacity from the CDEC daily reservoir storage summary. Updated daily.