USGS Water-Year Summary for Site USGS 11273400

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	Available Parameters
	00010 Temperature, water(Mean,Max.,Min.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Mean,Max.,Min.)
	00300 Dissolved oxygen(Mean,Max.,Min.)
	00400 pH(Max.,Min.,Med.)
	32315 Relative fChl, water, in situ(Min.,Med.,Max.)
	63680 Turbidity, Form Neph(Med.,Min.,Max.) [TS087: YSI 6136]
	63680 Turbidity, Form Neph(Min.,Max.,Med.) [TS213: YSI EXO]

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Water year 2024: 2024-10-01 to 2025-09-30

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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. Datum of gage is 2.55 ft above NAVD of 1988.

REMARKS - No records computed above 2,500 ft³/s. Natural flow of stream affected by storage reservoirs, ground-water withdrawals, diversions for irrigation, and imported water. Low flows consist mainly of return water from irrigated areas.

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.

REMARKS - Water-quality record may not represent total flow during times of backwater from the Merced River.

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