When are Measurements Made? - USGS Water Quality of SF Bay

Water Quality of San Francisco Bay

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When are Measurements Made?

The U.S. Geological Survey measurement program in San Francisco Bay began in 1968 and continues today. As the focus and objectives of the USGS programs of study in San Francisco Bay change from year to year, so do the sampling frequencies. In the past two decades we have made water quality measurements along the entire Bay-Delta system at least once each month. In addition, we sample more intensly in the South Bay during spring, the season of rapid water quality changes associated with the spring phytoplankton bloom, and also in the fall since 2000 due to the occurence of fall blooms.

Select a year and format from the form below to see the constituent table for any year: (1969-2006)

TABLE TYPE:	HTML Enhanced Table Preformatted Text Table	For years 1968-98, check box to include time line showing dates of cruises
YEAR:

To see sampling dates from the year 2007 on, go to the long-term data set page and chose the year you are interested in.

For upcoming sampling dates, view the 2009 cruise schedule.

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Page Last Modified: Tuesday, 27-Oct-2009 14:59:37 PDT