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Water-Year Summary for Site USGS 11162618

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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.
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Available Parameters
62614 Elevation, lake/res, NGVD29(Max.,Min.)  

Water year 2023: 2023-10-01 to 2024-09-30

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USGS Water-Year Summary 2023
11162618 Pilarcitos Lake near Hillsborough, CA
LOCATION - Lat 37°32'56", long 122°25'16" referenced to North American Datum of 1927, in SE 1/4 SE 1/4 sec.28, T.4 S., R.5 W., San Mateo County, CA, Hydrologic Unit 18050006, on dam, west side of spillway, and 2.0 mi southwest of Hillsborough.
DRAINAGE AREA - 3.91 mi².
REVISIONS HISTORY - WDR US-2009; 1999-2008.
PERIOD OF RECORD - October 1999 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929 and 2.66 ft above NAVD of 1988.
REMARKS - Reservoir is formed by earth-fill dam; storage began in 1866. Capacity is 2,900 acre-ft. Stores water for municipal use. Spillway elevation is 695.52 ft NGVD 1929. One flash board can be added to increase storage capacity to an elevation of 696.52 ft. NGVD 1929. Information was supplied by the San Francisco Public Utility Commission on Feb. 13, 2012.