Funding for this site is provided by:
40°49'32", long 73°05'59" referenced to North
American Datum of 1927, Suffolk County, NY, Hydrologic Unit 02030202,
at Duncan Avenue and Portion Road, in pumping center, in recorder
shelter, Lake Ronkonkoma.
Depth 855 ft. Upper casing diameter 4 in;
top of first opening 840 ft, bottom of last opening 850 ft. Datum of
gage is NGVD of 1929.
PERIOD OF RECORD.--
October 1968 to current year. Unpublished
records for October 1968 to September 1975 are available in files of
the U.S. Geological Survey.
Water-level recorder installed August 1986; 15-minute
recording interval. Periodic manual measurements made by USGS
Water level affected by nearby pumping. Cellular
water-level telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--
Highest water level recorded,
54.81 ft above NGVD 29, May 14 and 15, 2010; lowest recorded, 43.06 ft
above NGVD 29, August 28, 2017.