LOCATION.--Lat 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.
WELL CHARACTERISTICS.--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.
DATUM.--Land-surface datum is 133.5 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 2.13 ft above land-surface datum, 135.63 ft above National Geodetic Vertical Datum of 1929, Mar. 5, 1970 to Mar. 31, 2016; Top of blue insert in 4" Steel well, North Side, 135.67 ft above National Geodetic Vertical Datum of 1929, Mar. 21, 2016 to Mar. 14, 2024; Top of blue insert in 4" Steel well, North Side, 135.623 ft above National Geodetic Vertical Datum of 1929, Mar. 14, 2024 to present.  
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 Unpublished records for October 1968 to September 1975 are available in files of the U.S. Geological Survey.
GAGE.--Water-level recorder installed August 1986; 15-minute recording interval. Periodic manual measurements made by USGS personnel.
REMARKS.--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 of 1929, May 14, 15, 2010; lowest recorded, 43.06 ft above NGVD of 1929, Aug. 28, 2017.

Rating Curve

Get the latest shift-adjusted rating table for this site at the
USGS Rating Depot.   What is a shift-adjusted rating?

Station image