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USGS Water-Year Summary 2025
340606117223801 001S005W11F001S, Lilac Park Cluster Well at Rialto, CA
California Coastal Basin aquifers
LOCATION - Lat 34°06'11.20", long 117°22'39.86" referenced to North American Datum of 1983, in NE 1/4 NW 1/4 sec.11, T.1 S., R.5 W., San Bernardino County, CA, Hydrologic Unit 18070203, in SW 1/4 NW 1/4 sec.11, T.1 S., R.5 W., in Bud Bender Park, in the city of Rialto.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 947.5 ft. Upper casing diameter 2 in; top of first opening 930 ft, bottom of last opening 950 ft.
DATUM - Land-surface datum is 1,247.3 ft above North American Vertical Datum of 1988. Measuring point: TOP OF PVC CASING IN VAULT, 0.51 ft below land-surface datum, Jun. 9, 2010 to present. Prior to October 06, 2022 Land-surface datum is 1,247.06 ft above North American Vertical Datum of 1988.
PERIOD OF RECORD - Water year 1996 to current year.
GAGE - Four In-Situ, 30 psi vented, pressure transducers. Instruments are housed in a subterranean concrete and steel vault (with a USGS 2640 lock).
REMARKS - The Lilac Park Cluster Wells consist of four continuous record groundwater wells, located in a common ground-level vault. The individual stations are well 1S/5W-11F1, station 340606117223801; well 1S/5W-11F2, station 340606117223802; well 1S/5W-11F3, station 340606117223803; and well 1S/5W-11F4, station 340606117223804.
PERIOD OF DAILY RECORD - Water year 1996 to current year.
EXTREMES FOR PERIOD OF RECORD - Highest water level recorded, 268.14 ft below land surface, March 10, 2001; lowest water level recorded, 330.67 ft below LSD on August 17, 2023.
