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USGS Measurements of Water Quality in San Francisco Bay (CA), 1969-2015


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Cloern, J.E., and Schraga, T.S., 2016, USGS Measurements of Water Quality in San Francisco Bay (CA), 1969-2015 (ver. 3.0 June 2017): U. S. Geological Survey data release,


The U.S. Geological Survey maintains a program of water-quality studies in San Francisco Bay (CA) that began in 1969. This Data Release makes available all measurements made from 1969 through 2015. Water-quality constituents include salinity, temperature, light attenuation coefficient, and concentrations of chlorophyll-a, dissolved oxygen, suspended particulate matter, nitrate, nitrite, ammonium, silicate and phosphate. Water samples are collected at 37 fixed sampling locations along a 145-km transect from lower South San Francisco Bayo to the lower Sacramento River. A map of sampling locations is available on the project website at:


Point of Contact :
Tara Schraga
Originator :
James Cloern, Tara Schraga
Metadata Contact :
James Cloern
Publisher :
U. S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
USGS Mission Area :
Water Resources
SDC Data Owner :
National Research Program

Attached Files

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“Map of Sampling Stations”
thumbnail 362.75 KB image/jpeg
SanFranciscoBayWaterQualityData1969-2015v3.csv 8.96 MB text/csv
VersionHistory.txt 539 Bytes text/plain


The dataset was collected to measure spatial and temporal patterns of water-quality variability in San Francisco Bay as a component of long-term research to understand how estuarine-coastal ecosystems change in response to human activities and climate variability.
Map of Sampling Stations
Map of Sampling Stations


  • USGS Data Release Products

Associated Items



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On 27 December 2016, the data authors discovered that the data file associated with this data release had an error. The original data file had inconsistencies in the format of dates. The author corrected that error in the attached data file "SanFranciscoBayWaterQualityData1969-2015v2.csv." In May 2017, the data authors discovered that a small subset of the silicate measurements made between January 2011 and February 2014 have questionable reliability. The authors removed these data in the revised file: "SanFranciscoBayWaterQualityData1969-2015v3.csv"

Additional Information


Type Scheme Key
DOI doi:10.5066/F7TQ5ZPR

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