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to current year, are unpublished and available in files of the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 May 8 to June 16,
July 1 to Aug. 27, and Aug. 29 to Sept. 30, which are good; those for
Aug. 28, which are fair; and those for June 17-30, which are poor.
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, 7.07 ft, Aug.
28, 2011; minimum elevation, -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.
PERIOD OF DAILY RECORD1.--
WATER TEMPERATURE: October 2004 to current year.
SALINITY: October 2004 to current year.
DISSOLVED OXYGEN: October 2004 to current year.
TURBIDITY: October 2004 to current year.
CHLOROPHYLL: August 2006 to current year.
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
Telephone telemeter for water temperature,
specific conductance, dissolved oxygen, turbidity, chlorophyll, and
sampling depth parameters at station. Interruptions of record were due
to malfunction of water-quality monitor or sensors.
WATER TEMPERATURE: Records excellent, except those for May 24 to June
30, which are good.
SALINITY: Records excellent, except those for Oct. 20 to Nov. 24, Apr.
9 to May 20, June 20-30, July 9-28, and Aug. 8-24, which are good; and
for Nov. 25-30 and May 21-23 which are fair.
DISSOLVED OXYGEN: Records excellent, except those for Oct. 1-5, Nov.
12-30, Aug. 3-7, and Sept. 5-16, which are good; Aug. 8-13 and Sept.
17-20, which are fair; and Aug. 14-24, which are poor.
TURBIDITY: Records excellent, except those for Mar. 12-22 and July 2-3,
which are good; for July 4-5, which are fair; and July 6-28, which are
CHLOROPHYLL: Records excellent, except those for Oct. 1-5, Dec. 18 to
Jan. 3, Apr. 1-10, July 25-28, and Aug. 11-24, which are good; for Jan.
4-20, and Apr. 11-20,which are fair; and those for Jan. 21-28, and Apr.
21 to May 23, which are poor.
EXTREMES FOR PERIOD OF RECORD1.--
Maximum, 27.8°C, July 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,
June 24, 2008.
TURBIDITY: Maximum, 300 FNU, May 3, 4, 2010; minimum, <0.1 FNU
several days each year 2005-2011.
CHLOROPHYLL: Maximum, 100 ug/L, Apr. 11, 2010, but may have been higher
during period of missing record; minimum, <0.1 ug/L many days each
year 2006-08, June 9, 10, 2009.
EXTREMES FOR CURRENT YEAR1.--
Maximum, 27.3°C, July 22; minimum, -1.2°C, Jan. 24.
SALINITY: Maximum, 32.8 psu, Apr. 13, 16; minimum, 21.9 psu, Aug.
DISSOLVED OXYGEN: Maximum, 14.9 mg/L, June 20; minimum, 4.2 mg/L, Aug.
TURBIDITY: Maximum, 150 FNU, Aug. 29; minimum, <0.1 FNU, on many
CHLOROPHYLL: Maximum, 80 ug/L, June 28; minimum, 0.5 ug/L, July
1 Water-Quality Records
Derived from NY Annual Water-Data Report 2011
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