This station is operated in cooperation
NYS Department of Environmental Conservation
Town of Hempstead Dept.of Conservation and
Lat 40°35'36", long 73°35'03"
referenced to North American Datum of 1927, Nassau County, NY,
Hydrologic Unit 02030202, at Town of Hempstead East Marina, 750 ft east
of Loop Parkway Bridge, in Point Lookout. Water-quality monitor at site
100 ft north.
PERIOD OF RECORD.--
December 1997 to current year. January 1974
to June 1994, in files of Town of Hempstead Department of Conservation
& Waterways. Precipitation, wind speed and direction, air
temperature, relative humidity, and barometric pressure records for
March 1998 to current year, and solar radiation records for August 2004
to current year, are unpublished and available in files of the
Water-stage recorder. Datum of gage is NGVD of 1929.
January 1974 to June 1994, water-stage recorder at site 150 ft
Records excellent, except those for Oct. 1 to Jan. 1
and Feb. 27 to Aug. 30, which are good. Satellite and telephone
elevation, precipitation, and wind speed and direction telemeter at
station. Telephone telemeter for air temperature, relative humidity,
barometric pressure, and solar radiation parameters at station.
EXTREMES FOR PERIOD OF RECORD.--
Maximum elevation, 5.75 ft, Apr.
16, 2007; minimum, -4.28 ft, Mar. 9, 2005.
EXTREMES OUTSIDE PERIOD OF RECORD.--
Storm tide of Sept. 27,
1985, reached an elevation of 7.3 ft, from information provided by Town
of Hempstead Department of Conservation & Waterways. Storm tide of
Dec. 11, 1992, reached an elevation of 7.3 ft, from high-water mark at
site 4.0 mi west. Minimum elevation recorded, -4.9 ft, Jan. 11, 1978,
Mar. 16, 1980, from information provided by Town of Hempstead
Department of Conservation & Waterways.
EXTREMES FOR CURRENT YEAR.--
Maximum elevation, 5.67 ft, Oct. 18;
minimum, -3.57 ft, Jan. 30.
PERIOD OF RECORD1.--
October 2004 to current year.
Water temperature records for March 1998 to September 2004, and
sampling depth records for October 2004 to current year are unpublished
and available in files of the Geological Survey.
Water-quality monitor provides
12-minute-interval readings collected from 1.6 ft above bottom. October
2004 to February 2005, water-quality monitor provided 6-minute-interval
readings. Salinity record computed from specific-conductance
EXTREMES FOR PERIOD OF RECORD1.--
Maximum, 27.8°C, Jul. 20, 2005; minimum, -1.7°C, Jan. 23, 24, 28,
SALINITY: Maximum, 34.6 psu, Feb. 9, 2010; minimum, 21.4 psu, Oct. 14,
DISSOLVED OXYGEN: Maximum, 15.9 mg/L, Mar. 1, 2007; minimum, 1.9 mg/L,
Jun. 24, 2008.
TURBIDITY: Maximum, 300 FNU, May. 3, 2010; minimum, <0.1 FNU several
days each year 2005-2010.
CHLOROPHYLL: Maximum, 110 ug/L, Apr. 10, 2010; minimum, <0.1 ug/L
many days each year 2006-08, Jun. 9, 10, 2009.
EXTREMES FOR CURRENT YEAR1.--
Maximum, 27.6°C, Jul. 12; minimum, -0.2°C, Feb. 7.
SALINITY: Maximum, 34.6 psu, Feb. 9; minimum, 26.2 psu, Mar. 14.
DISSOLVED OXYGEN: Maximum, 14.3 mg/L, Feb. 22; minimum, 2.9 mg/L, May.
TURBIDITY: Maximum, 300 FNU, May. 3; minimum, <0.1 FNU, on several
CHLOROPHYLL: Maximum, 83 ug/L, Apr. 8; minimum, 0.3 ug/L, Feb. 4.
1 Water-Quality Records
Derived from NY Annual Water-Data Report 2010
Peak Flow and Stage Information
Webcam view of
Reynolds Channel Picture updated hourly
Webcam view of
Atlantic Ocean shore
Elevation (observed) and tide elevation (predicted)
for this station are reported to NGVD 1929. To convert data to
NAVD 1988 subtract 1.13 ft. To convert data to MLLW datum add
1.10 ft. These corrections vary from site to site.
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
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 Canada.
mean lower low water, which is a site-specific datum determined
by averaging the lowest of the 2 low tides that occur each day
over a 19-year tidal epoch. For tide gages with less than 19
years of record, this datum is estimated by correlation with
long-term tide gages.
Additional sensor graph(s) available (click on graph or sensor