San Andreas Lake

Name: San Andreas Lake (California) water level
Creator: U.S. Geological Survey

at Dam Nr Millbrae, CA · California · USGS gauge

Water level · NAVD88

446.81FT

Gauge elevation · no % full published

7 days −0.04 ft30 days +0.75 ftvs last year +0.74 ft

Reading for Oct 25, 2026, 17:45 UTC · page refreshed Oct 25, 21:16 UTC
Source: U.S. Geological Survey (Water Data for the Nation)

Worth going today?Today

Looks good

Light wind, dry

Wind2 to 8 mph

Rain0%

Temp68°F

Level446.8 ft

TodayMostly Sunny · 68°F
NW 2 to 8 mph · rain 0%

TonightPartly Cloudy · 54°F
W 8 mph · rain 1%

NWS forecast for the gauge location. Good = wind ≤ 10 mph and rain ≤ 30%; storms are flagged. Not safety advice – check local conditions, closures and warnings.

Field notes

On Oct 25, 2026, San Andreas Lake was at 446.81 (NAVD88) ft.

The level has been roughly steady over the past week (−0.04 ft).

Compared with a year ago (446.07 ft, same time of day), the lake is 0.74 ft higher.

Readings come from the USGS gauge “SAN ANDREAS LAKE A DAM NR MILLBRAE CA”. Gauge elevations are not directly comparable between lakes because each uses its own datum.

Lake facts

Gauge / station	SAN ANDREAS LAKE A DAM NR MILLBRAE CA
Elevation datum	ft (NAVD88)
Gauge location	37.6027, -122.4282

Nearby lakes

Pilarcitos Lake4 mi S679.45 ft−0.33 ft Lower Crystal Springs Reservoir7 mi SE272.48 ft+0.44 ft Calaveras Reservoir34 mi E725.06 ft−0.65 ft Lake Berryessa65 mi N427.74 ft−0.37 ft Lake Natoma99 mi NE124.02 ft+2.32 ft

Common questions

Is San Andreas Lake rising or falling?

Over the last 7 days it changed −0.04 ft and over 30 days +0.75 ft.

How full is San Andreas Lake?

USGS publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.

How often is this page updated?

The page is rebuilt automatically every day from USGS's published data. Values can be revised later by the source agency.

Where does the data come from?

The U.S. Geological Survey's Water Data API (api.waterdata.usgs.gov), which publishes readings from USGS and partner gauges. Forecasts come from the National Weather Service.

Latest instantaneous reading; 7-day, 30-day and year-ago changes compare readings at the same hour. USGS data are provisional and subject to revision. This page is not affiliated with or endorsed by the USGS. See data sources.