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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
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USGS Water-Year Summary 2024
403727073154601 S 21091. 1
Northern Atlantic Coastal Plain aquifer system
Lloyd Aquifer
Lloyd Aquifer
LOCATION - Lat 40°37'28.3", long 73°15'46.2" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, at Robert Moses State Park, in water treatment building, Fire Island.
GROUNDWATER RECORDS
WELL CHARACTERISTICS - Depth 1,921 ft. Upper casing diameter 6 in; top of first opening 1,918 ft, bottom of last opening 1,921 ft. Datum of gage is NGVD of 1929.
DATUM - Land-surface datum is 8.82 ft above North American Vertical Datum of 1988. Measuring point: Top of casing, 13.68 ft above land-surface datum, 23.68 ft above National Geodetic Vertical Datum of 1929, Jun. 3, 1965 to Feb. 6, 2024; Top of blue casing, 23.812 ft above National Geodetic Vertical Datum of 1929, Feb. 6, 2024 to May 7, 2024; Top of blue casing, 22.66 ft above North American Vertical Datum of 1988, May 7, 2024 to present.
PERIOD OF RECORD - January 1968 to current year. Unpublished records for September 1962 to September 1975 are available in files of the U.S. Geological Survey.
GAGE - Water-level recorder installed October 1994 to January 2000, May 2001 to current year. Periodic manual measurements made by USGS personnel.
REMARKS - Water level affected by tidal fluctuation. Cellular water-level telemeter at station.
EXTREMES FOR PERIOD OF RECORD - Highest water level recorded, 22.56 ft above NGVD 29, Apr. 16, 2007; lowest measured, 15.13 ft above NGVD 29, June 2, 1972.
