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Water-Year Summary for Site 11176200

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  • Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
  • For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
  • For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
  • For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
  • Not all sites have reports available for every water year.
Available Parameters
00060 Discharge(Mean)  
80155 Suspnd sedmnt disch(Mean)  
80225 Bedload sediment(Mean)  

Water year 2023: 2022-10-01 to 2023-09-30
 
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USGS Water-Year Summary 2023
11176200 ARROYO MOCHO NR PLEASANTON CA
LOCATION - Lat 37°41'26", long 121°52'20" referenced to North American Datum of 1927, Alameda County, CA, Hydrologic Unit 18050004, in Santa Rita Grant, on right bank, 0.3 mi upstream of Santa Rita Road bridge, 0.8 mi downstream of Arroyo Las Positas, and 2 mi north of Pleasanton.
SURFACE-WATER RECORDS
PERIOD OF RECORD - September 1962 to December 1985, October 2016 to May 1, 2022 (discontinued) (seasonal record October 1 to April 30).
COOPERATION - Since October 2016, discharge records collected by Alameda County Zone 7 Water Agency, under general supervision of the U.S. Geological Survey.
WATER-QUALITY RECORDS
PERIOD OF RECORD -

DISCRETE WATER-QUALITY DATA:
CHEMICAL ANALYSES: Water years 1981 to June 1983.
TOTAL LOAD SEASONAL PERIODIC: Water years December 1, 2016 to May 1, 2022 (storm season only).

CONTINUOUS WATER-QUALITY DATA:
SPECIFIC CONDUCTANCE: Water years 1980-1983.
SEDIMENT DATA: Water years December 2016 to May 1, 2022 ((storm season only).

REMARKS - The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in WY2017.
EXTREMES FOR PERIOD OF RECORD - SUSPENDED SEDIMENT.--Maximum monthly load, 35,500 tons, Feb. 2017. Minimum monthly load, 174 tons, Dec. 2016.