Funding for this site is provided by:
40°51'24.8", long 73°42'05.3" referenced to North
American Datum of 1983, Nassau County, NY, Hydrologic Unit 02030201,
Located at Helen Keller National Center for Deaf-Blind Youths and
Adults, 300 ft north of Middle Neck Road, westernmost well, Sands
Depth 396 ft. Upper casing diameter 6 in;
top of first opening 378 ft, bottom of last opening 388 ft.
PERIOD OF RECORD.--
August 1957 to January 2000, January 2002 to
November 2008, July 2011 to current year. Unpublished records for
August 1957 to September 1975 are available in the files of the U.S.
Water-level recorder installed January 11, 2003;
15-minute recording interval. Periodic manual measurements made by USGS
Water level affected by tidal fluctuation and nearby
pumping. Cellular water-level telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--
Highest water level recorded,
11.49 ft above sea level, May 31 and June 1, 1983; lowest recorded,
50.36 ft below sea level, August 27, 2016.