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USGS 405010073415009 N 12232. 1

PROVISIONAL DATA SUBJECT TO REVISION

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> Site Information
LOCATION.--Lat 40°50'10.0", long 73°41'48.1" referenced to North American Datum of 1983, Nassau County, NY, Hydrologic Unit 02030201, at Port Washington Water District, north side of Bayside Avenue, Port Washington.
WELL CHARACTERISTICS.--Depth 384 ft. Upper casing diameter 4 in; top of first opening 364 ft, bottom of last opening 384 ft.
DATUM.--Land-surface datum is 17 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of casing, 0.88 ft below land-surface datum, 16.12 ft above National Geodetic Vertical Datum of 1929, Jul. 30, 1993 to Dec. 31, 2005; N/S of 4inch pvc casing, 16.14 ft above National Geodetic Vertical Datum of 1929, Jun. 12, 2013 to present.
PERIOD OF RECORD.--July 1993 to March 1997, March 2002 to current year.
GAGE.--Periodic manual measurements by USGS personnel.
EXTREMES FOR PERIOD OF RECORD.--Highest water level measured, 11.41 ft above NGVD of 1929, Mar. 26, 2013; lowest measured, 3.96 ft below NGVD of 1929, July 24, 2013.
> Rating Information
Available Parameters Available Period
  
2025-08-26  2025-09-05








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Summary of all available data for this site
Instantaneous-data availability statement

Groundwater level above NAVD 1988, feet
Most recent instantaneous value: -2.95 09-05-2025   17:00 EST
Graph of Groundwater level above NAVD 1988, feet

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