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CaliforniaReservoir, 586 acres

Lower Crystal Springs Reservoir water level

Lower Crystal Springs Reservoir, California
Photo: Dicklyon, CC BY-SA 4.0

Current level

272.54ft NAVD88

Reading from Oct 25, 2026

Below normal for October

Past 24 hours
+0.13ft
Past 7 days
+0.44ft
Past 30 days
+0.79ft
vs typical October
-8.09ft

Lower Crystal Springs Reservoir was at 272.54 ft on October 25, rising 0.44 ft over the past week. That is below normal for October: the typical October level is 280.63 ft, so the lake is 8.09 ft below its usual mark.

Last 30 days

271.5272.0272.5Sep 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.

260270280290JFMAMJJASOND

Recent daily readings

Lower Crystal Springs Reservoir daily mean water level, newest first
DateLevel (ft NAVD88)Change
Oct 24, 2026272.41+0.08
Oct 23, 2026272.33+0.06
Oct 22, 2026272.27+0.02
Oct 21, 2026272.25+0.09
Oct 20, 2026272.16+0.06
Oct 19, 2026272.10+0.02
Oct 18, 2026272.08+0.09
Oct 17, 2026271.99+0.04
Oct 16, 2026271.95+0.01
Oct 15, 2026271.94+0.02
Oct 14, 2026271.92+0.06
Oct 13, 2026271.86+0.04
Oct 12, 2026271.82+0.07
Oct 11, 2026271.75+0.09

Reading these numbers

Readings are elevations in feet above the North American Vertical Datum of 1988 (NAVD88), the current national reference. Older dam documents often quote NGVD29 instead, which can differ by a few feet. See 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 listed by USGS as Lower Crystal Springs Reservoir near San Mateo 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.

Lower Crystal Springs Reservoir water level questions

What is the water level at Lower Crystal Springs Reservoir today?

Lower Crystal Springs Reservoir was at 272.54 ft on October 25, rising 0.44 ft over the past week. That is below normal for October: the typical October level is 280.63 ft, so the lake is 8.09 ft below its usual mark.

Is Lower Crystal Springs Reservoir high or low right now?

Compared with the long-term record for October, the lake is below normal. The October monthly average has ranged from 260.08 to 283.67 ft, with a typical value of 280.63 ft.

Is Lower Crystal Springs Reservoir rising or falling?

Over the last seven days the level has risen (+0.44 ft), and it is +0.79 ft compared with 30 days ago.

Where does the Lower Crystal Springs Reservoir water level data come from?

From the U.S. Geological Survey, gauge 11162750 (Lower Crystal Springs Reservoir near San Mateo 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 Lower Crystal Springs is blown out, these are the closest alternatives. Tap through for their water levels.