United States Geological Survey (USGS): Continuous monitoring in the San Francisco Bay and Sacramento San-Joaquin Delta
Frequency of collection: 15 minutes real time, plus some historical daily data
Method of parameter collection: Calibrated optical backscatterance sensors (OBS) - triggered by an electronic data logger. Every 15 minutes the sensor collects data every second for one minute and averages the output voltage.
Data format: Filenames are .sdf
Period of collection: 1989-2007. Webpage will be updated as more data becomes available. Data availability variable among individual sites.
Parameter collection locations: 17 sites: Dumbarton Bridge, San Mateo Bridge, Alcatraz, San Pablo Bay Channel, Marker 1 (in San Pablo Bay), Carquinez, Benicia Bridge, Mallard Island, marker 17 (south of Dumbarton), Pier 24, Golden Gate Bridge, Point San Pablo, Marker 9 (in San Pablo Bay), Mare Island, Causeway, and Martinez.
Version 1.2 This page was last updated on May 7, 2010 and will continue to be updated frequently.