This station is operated in cooperation
Nassau County Office of Emergency
Lat 40°53'18.8", long 73°38'16.8"
referenced to North American Datum of 1983, Nassau County, NY,
Hydrologic Unit 02030201, on southern shore at Nassau County Welwyn
Preserve, at Glen Cove.
PERIOD OF RECORD.--
May 2009 to current year.
Water-stage recorder. Datum of gage is NGVD of
Records good, except those for Oct. 1 to Jan. 19, Feb.
4 to Mar. 13, Mar. 17-24, Apr. 6-13, May 25-28, July 6-27, and Sept.
14-30, which are fair; and those for Jan. 20 to Feb. 3, Mar. 14-16,
Apr. 14 to May 24, May 29 to June 21, and those from reconstructed
graph for June 22-23, which are poor. Interruptions of record during
June 22-23 due to siphon line malfunction. Satellite elevation
telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--
Maximum elevation, 9.30 ft, Aug.
28, 2011; minimum elevation, -0.26 ft, Dec. 8, 2009.
EXTREMES OUTSIDE PERIOD OF RECORD.--
Storm tide of Dec. 11, 1992,
reached an elevation of 11.5 ft, from high-water mark at site 1.9 mi
Derived from NY Annual Water-Data Report 2011
Peak Flow and Stage Information
Estuary or ocean water surface elevation for this
station is reported to NGVD 1929. To convert data to NAVD 1988
subtract 1.08 ft. These corrections vary from site to
1929 is the National Geodetic Vertical Datum of 1929,
formerly called "mean sea level" or "Sea Level
Datum of 1929." NGVD 1929 was a general adjustment of the
first-order level nets fit to mean sea level at 26 tide gages in
the US and Canada.
1988 is the North American Vertical Datum of 1988, which is a
geodetic datum derived from a general adjustment of the
first-order level nets fit to 1 tide gage in eastern
Additional sensor graph(s) available (click on graph or sensor
elevation, astronomical-tide elevation, and residual water level
Graph updated every 15 minutes
link to graph