USGS Water-Year Summary for Site 11176900

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	Available Parameters
	00010 Temperature, water(Min.,Med.,Mean,Max.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Min.,Mean,Med.,Max.)
	00400 pH(Min.,Max.,Med.)
	80154 Suspnd sedmnt conc(Mean)
	80155 Suspnd sedmnt disch(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

11176900 Arroyo de La Laguna at Verona, CA

LOCATION - Lat 37°37'36", long 121°52'55" referenced to North American Datum of 1927, in sec.00, T.3 S., R.1 E., Alameda County, CA, Hydrologic Unit 18050004, in Valle de San Jose Grant, on left bank at Verona Bridge, 0.9 mi downstream from Castlewood Drive bridge, and 2.5 mi southwest of Pleasanton.

DRAINAGE AREA - 403 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - January 1912 to September 1930, October 1969 to September 1983, October 1987 to September 2003 (published as "near Pleasanton", station 11177000), October 2003 to current year.

GAGE - Water-stage recorder and crest-stage gage. Datum of gage is 260.11 ft above NAVD of 1988. January 1912 to September 1917, at site 2.2 mi upstream at different datum. October 1917 to September 1930, at site 1.6 mi downstream at different datum. October 1969 to September 2003, at site 0.8 mi downstream at different datum.

REMARKS - Flow partly regulated by Del Valle Reservoir 14 mi upstream, beginning in September 1968, capacity, 77,100 acre-ft. Water imported from Sacramento-San Joaquin Delta (see REMARKS for station 11176500). See schematic diagram of Alameda Creek Basin available from the California Water Science Center.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 16,000 ft³/s, Dec. 31, 2022, gage height, 22.60 ft, maximum gage height, 22.61 ft, Jan. 5, 1982, at site and datum then in use; no flow at times.

WATER-QUALITY RECORDS

PERIOD OF RECORD -

DISCRETE WATER-QUALITY DATA:
CHEMICAL DATA: Water years October 1959 to June 1963.
SEDIMENT DATA: Water years 2007 to current year (storm season only).

CONTINUOUS WATER-QUALITY DATA:
pH: Water years November 2003 to current year.
SPECIFIC CONDUCTANCE: Water years November 2003 to current year.
WATER TEMPERATURE: Water years October 1959 to June 1963, November 2003 to current year.
SEDIMENT DATA: Water years October 2006 to current year (storm season only).

REMARKS - The practice of assigning qualitative accuracy ratings to water-quality data was discontinued in WY17.