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CaliforniaReservoir

Lake San Antonio water level

Lake San Antonio, California
Photo: Cam Vilay, CC BY 3.0

Current level

737.77ft NGVD29

Reading from Oct 25, 2026

Well below normal for October

Past 24 hours
-0.04ft
Past 7 days
-0.03ft
Past 30 days
-1.48ft
vs typical October
-17.77ft

Lake San Antonio was at 737.77 ft on October 25, holding steady over the past week (-0.03 ft). That is well below normal for October: the typical October level is 755.54 ft, so the lake is 17.77 ft below its usual mark.

Last 30 days

738.0739.0Sep 24Oct 9Oct 24

Shaded band shows the lowest and highest October monthly averages on record. Dashed line is the typical October level.

Typical level through the year

Each bar spans the range of monthly averages on record for that month. The line marks the median. The orange dot is where the lake sits now.

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Recent daily readings

Lake San Antonio daily mean water level, newest first
DateLevel (ft NGVD29)Change
Oct 24, 2026737.81-0.02
Oct 23, 2026737.83-0.02
Oct 22, 2026737.85+0.02
Oct 21, 2026737.83+0.04
Oct 20, 2026737.79-0.01
Oct 19, 2026737.80-0.02
Oct 18, 2026737.82-0.01
Oct 17, 2026737.83-0.03
Oct 16, 2026737.86-0.01
Oct 15, 2026737.87-0.02
Oct 14, 2026737.89-0.03
Oct 13, 2026737.92-0.01
Oct 12, 2026737.93-0.02
Oct 11, 2026737.95-0.02

Reading these numbers

Readings are elevations in feet above the National Geodetic Vertical Datum of 1929 (NGVD29), the reference most older dam and lake charts use. If you compare with a newer chart in NAVD88, expect a difference of a few feet. Our glossary explains NGVD29 vs NAVD88.

Reservoir levels are managed. Operators lower them ahead of flood season, hold them for summer recreation, and draw them down for dam work. When the lake falls well below its usual level, shallow points and stumps start showing up in places that are normally safe.

High water brings its own problems: floating debris after storms, flooded docks and courtesy piers, and no-wake rules near flooded campgrounds. A quick look at the trend before you hitch up saves a wasted trip.

The gauge is about 6 miles from the center of the lake and is listed by USGS as San Antonio Reservoir near Bradley CA. Wind can pile water up at one end of a big lake for a few hours, so short spikes on a windy day are normal.

Lake San Antonio water level questions

What is the water level at Lake San Antonio today?

Lake San Antonio was at 737.77 ft on October 25, holding steady over the past week (-0.03 ft). That is well below normal for October: the typical October level is 755.54 ft, so the lake is 17.77 ft below its usual mark.

Is Lake San Antonio high or low right now?

Compared with the long-term record for October, the lake is well below normal. The October monthly average has ranged from 742.62 to 760.50 ft, with a typical value of 755.54 ft.

Is Lake San Antonio rising or falling?

Over the last seven days the level has held roughly steady (-0.03 ft), and it is -1.48 ft compared with 30 days ago.

Where does the Lake San Antonio water level data come from?

From the U.S. Geological Survey, gauge 11150100 (San Antonio Reservoir near Bradley CA). USGS publishes provisional readings every 15 to 60 minutes; they can be revised later after quality checks.

How often is this page updated?

The page itself is rebuilt every day with the latest daily values, and the current reading refreshes straight from the USGS each time you open it.

Nearby lakes

If San Antonio is blown out, these are the closest alternatives. Tap through for their water levels.