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Tracy Research Technical Report Abstract

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Volume 22

Craft, D., Housewright, R., and J. Fields, 2003. Semi-continuous Water Quality Measurements at the Tracy Fish Collection Facility, Tracy, California, April 2001 to March 2002, Volume 22, U. S. Bureau of Reclamation, MP Region and Denver Technical Service Center, 66 pp. including appendix.

Water quality variables temperature, pH, dissolved oxygen, conductivity, oxidation-reduction potential, and turbidity were measured at 30-minute intervals using a calibrated Hydrolab Datasonde 4a multi-probe installed in the Old River at the Bureau of Reclamation's (Reclamation) Tracy Fish Collection Facility (TFCF), located near Tracy, California in the southern region of the Sacramento-San Joaquin River Delta (Delta). This is the second year of validated data collection and covers data collection from April 1, 2001 through March 31, 2002. The water quality data were compared to local meteorology, hydrology, tides, export pumping at state and Federal pumping plant, fish salvage, and temporary barrier installation and removal schedule data. Water quality data for April 1, 2001 through March 31, 2002 were comparable to the previous year's validated data. Annual median values were 18.1̊ C. for temperature, 463 µS/cm for conductivity, 7.9 mg/L for dissolved oxygen, 554 mV for redox potential, 7.65 for pH, and 24.8 NTU for turbidity. The most significant influence on water quality appears to be the status of nearby temporary channel barriers and the operation of the Delta Cross Channel near Walnut Grove, California. When barriers are installed and the Cross Channel gates are open from April through October, daily variations and maximum EC are much lower than when higher conductivity water from the San Joaquin River flows relatively unimpeded to the TFCF.

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Updated January 29, 2013