USGS Water-Year Summary 2024
11273400 San Joaquin River above Merced River, near Newman, CA
LOCATION - Lat 37°20'50.2", long 120°58'30.5" referenced to North American Datum of 1927, in SW 1/4 SW 1/4 sec.03, T.7 S., R.9 E., Stanislaus County, CA, Hydrologic Unit 18040001, on left bank, 1,000 ft upstream from the Merced River, 1,500 ft upstream from bridge on Hills Ferry Road/Kelley Road, and 3.4 mi northeast of Newman.
DRAINAGE AREA - 7,949 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 2009 to current year (low-flow station only).
GAGE - Water-stage recorder. Elevation of gage is 60 ft above NGVD of 1929, from topographic map.
EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 66.34 ft, Feb. 13, 2017, discharge unknown; minimum daily, 12 ft³/s, Oct. 3 2022.
WATER-QUALITY RECORDS
PERIOD OF RECORD -
DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years 2014-2017.
CONTINUOUS WATER-QUALITY DATA:
DISSOLVED OXYGEN: Water years October 2009 to current year. (water years 2009-2023, daily).
pH: Water years April 2012 to current year. (water years 2012-2023, daily).
SPECIFIC CONDUCTANCE: Water years August 2009 to current year. (water years 2009-2023, daily).
WATER TEMPERATURE: Water years August 2009 to current year. (water years 2009-2023, daily).
TURBIDITY: Water years April 2012 to current year. (water years 2012-2023, daily).
CHLOROPHYLL: Water years April 2012 to current year. (water years 2012-2023, daily).
INSTRUMENTATION - Water-quality monitor since August 2009.
EXTREMES FOR PERIOD OF DAILY RECORD - DISSOLVED OXYGEN: Maximum recorded, 21.0 mg/L, July 13, 2013; minimum recorded, 1.2 mg/L, June 6, 2019.
pH: Maximum recorded, 9.0 standard units, several days in July 2013, June 28, 29, 2014; minimum recorded, 6.4 standard units, June 25, 2017.
SPECIFIC CONDUCTANCE: Maximum recorded, 4,890 microsiemens, June 21, 2015; minimum recorded, 79 microsiemens, June 27, 2017.
WATER TEMPERATURE: Maximum recorded, 34.4°C, June 26,2015; minimum recorded, 4.6°C, Dec. 10, 2014.
TURBIDITY: Maximum recorded, 488 FNU, March 25, 2018; minimum recorded, 1.1 FNU, Dec 17, 18 2015.
CHLOROPHYLL: Maximum recorded, 99.7 ug/L, May 12, 2016; minimum recorded, 4.1 ug/L, Sept. 27, 2014. CHLOROPHYLL RFU: Maximum recorded, 7.9 RFU, Sept. 5, 2017; minimum recorded, 0.6 Jan. 19, 2017