Active USGS

San Francisco Bay A Ne Shore Alcatraz Island Ca

Updated August 2, 2026 at 06:00:00 AM · Provisional · Site 374938122251801

Current conditions

Historical trends

Hourly measurements

Detailed readings by hour, organized by day

Nearby stations

Other monitoring locations nearby

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Official USGS page: https://waterdata.usgs.gov/monitoring-location/USGS-374938122251801/ (may include cooperator information)