LOCATION.--Lat 40°36'31.15", long 73°39'22.22" referenced to North American Datum of 1983, Nassau County, NY, Hydrologic Unit 02030202, at Village of Island Park Masone Beach Pier, in Island Park.
PERIOD OF RECORD.--October 2010 to current year.
GAGE.--Water-stage recorder. Datum of gage is NGVD of 1929.
REMARKS.--Elevation WY 2014: Records good, except those for Oct. 26 to Dec. 3, June 11 to Aug. 21, Sept. 25-30, which are fair, Dec. 4 to Jan. 1, Aug. 22 to Sept. 24, which are poor, and Jan. 2 to May 28, which were deleted. Periods of missing record were estimated with MISTE using a linear regression with 01311145 and 01310740. Satellite elevation telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 10.89 ft, Oct. 29, 2012; minimum elevation, -4.22 ft, Feb. 20, 2015.
EXTREMES OUTSIDE PERIOD OF RECORD.--Storm tide of Dec. 11, 1992, reached an elevation of 7.3 ft, from high-water mark at site 1.1 mi south-southwest.
PERIOD OF RECORD¹.--October 2010 to current year. Sampling depth records for October 2010 to current year are unpublished and available in files of the Geological Survey.
PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: October 2010 to current year. SALINITY: October 2010 to current year. DISSOLVED OXYGEN: October 2010 to current year. pH: October 2012 to current year. TURBIDITY: October 2010 to current year. CHLOROPHYLL: October 2010 to current year. NITRATE: March 2011 to April 2022.
INSTRUMENTATION¹.--Water-quality monitor provides 6-minute-interval readings collected from 1.6 ft above bottom. Nitrate analyzer provides 30-minute-interval readings collected from 1.6 ft above bottom. Salinity record computed from specific-conductance readings.
REMARKS¹.--Satellite telemeter for water temperature, specific conductance, dissolved oxygen, pH, turbidity, chlorophyll, nitrate, and sampling depth parameters at station. WATER TEMPERATURE WY 2016: Records excellent. SALINITY WY 2016: Records excellent, except those for Oct. 1-13, May 12 to June 7, June 26 to July 23, Sept. 5-7, 12-26, which are good, Oct. 14-23, July 24-30, Sept. 27-30, which are fair, and Oct. 24 to Nov. 17, July 31 to Aug. 10, which are poor. DISSOLVED OXYGEN WY 2016: Records excellent, except those for May 20 to June 7, 9-20, Aug 13-17, Aug. 19 to Sept. 2, Sept. 7, which are good, June 21-29, Sept. 3-6, which are fair, and June 30 to July 12 which are poor. TURBIDITY WY 2016: Records excellent, except those for Mar. 14-15, May 4-6, 8, 16, 18, 20-21, 28, June 2, 29, July 1-2, 5, Aug. 16, Sept. 2-4, 6-7, 29, which are good, and Sept. 1, which is fair. CHLOROPHYLL WY 2016: Records excellent, except those for Dec. 11-17, 19-23, 29, 31, Jan. 2-8, Feb. 28 to Mar. 1, 3-14, May 10-28, July 17-23, Aug. 15-24, which are good, Jan. 9-10, 12, 14, May 29 to June 7, July 24-29, Aug 25 to Sept. 3, which are fair, and Jan. 11, 13, July 30 to Aug. 10, Sept. 4-7, which are poor. NITRATE WY 2016: Records excellent, except those for Oct. 3, 6-8, Nov. 20 to Dec. 3, Dec. 20 to Jan 13, Apr. 20-25, Aug. 23 to Sept. 7, Sept. 20-30, which are good and Jan. 14, which is fair.
EXTREMES FOR PERIOD OF RECORD¹.--WATER TEMPERATURE: Maximum, 30.8 °C, Aug. 15, 2016; minimum, -1.8 °C, Jan. 5, 6, 2018. SALINITY: Maximum, 38.4 psu, Oct. 28, 2015; minimum, 19.9 psu, Aug. 28, 2011. DISSOLVED OXYGEN: Maximum, 19.0 mg/L, July 13, 2017, Feb. 21, 2018; minimum, 1.1 mg/L, July 17, 2024. pH: Maximum, 8.9 standard units, Feb. 15, 2023; minimum, 7.1 standard units, June 2, 2013. TURBIDITY: Maximum, 360 FNU, Dec. 8, 2011; minimum, <0.1 FNU, on several days throughout the recorded period. CHLOROPHYLL: Maximum, 140 ug/L, Apr. 4, 2011; minimum, <0.1 ug/L, on several days throughout the recorded period. NITRATE: Maximum, 1.6 mg/L as N, Feb. 2, 2012, higher values may have occurred during periods of missing record; minimum, <0.01 mg/L as N, on several days throughout the recorded period.
¹ Water-Quality Records

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NAVD 1988 Datum Conversion Information

Elevation observations and tidal predictions for this station are reported to NGVD 1929. To convert data to NAVD 1988 subtract 1.12 ft. To convert data to MHHW datum subtract 3.53 ft. To convert data to MLLW datum add 1.52 ft. These corrections vary from site to site.

NGVD 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. NAVD 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 Canada. MHHW is mean higher high water, which is a site-specific datum determined by averaging the highest of the 2 high 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. MLLW is 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.

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