LOCATION.--Lat 40°55'04.0", long 72°38'19.2" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, at County Road 105 bridge, in Riverhead.
PERIOD OF RECORD.--August 2012 to current year.
GAGE.--Water-stage recorder. Datum of gage is NGVD of 1929.
REMARKS.--ELEVATION - Satellite elevation telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 8.56 ft, Oct. 29, 2012; minimum elevation, -3.59 ft, Jan. 5, 2018.
EXTREMES OUTSIDE PERIOD OF RECORD.--Storm tide of Dec. 11, 1992, reached an elevation of 8.2 ft, from high-water mark at site 1.7 mi northeast.
PERIOD OF RECORD¹.--August 2012 to current year.
PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: August 2012 to current year. SALINITY: August 2012 to current year. DISSOLVED OXYGEN: August 2012 to current year. TURBIDITY: August 2012 to current year. CHLOROPHYLL: August 2012 to current year. NITRATE: August 2012 to August 2020. pH: June 2017 to current year.
INSTRUMENTATION¹.--Water-quality monitor provides 6-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, and chlorophyll parameters at station.
EXTREMES FOR PERIOD OF RECORD¹.--WATER TEMPERATURE: Maximum, 30.4 °C, July 18, 19, and 20, 2013; minimum, -1.6 °C, Jan. 30, 2022. SALINITY: Maximum, 30.0 psu, Dec. 27, 2022; minimum, 11.4 psu, Jan. 9, 2020. DISSOLVED OXYGEN: Maximum, 18.0 mg/L, Mar. 22, 2021; minimum, 0.0 mg/L, several days in July 2023, June 24, 2024. pH: Maximum, 8.6 pH units, Dec. 17, 2020, Jan. 16, 19, Mar. 11, 2022; minimum, 6.6 pH units, Apr. 8, 2020.  TURBIDITY: Maximum, 630 FNU, Oct. 14, 2013; minimum, <0.1 FNU, many days. CHLOROPHYLL: Maximum, 500 ug/L, Sept. 29, 2012; minimum, <0.1 ug/L, June 4, 2016. NITRATE: Maximum, 0.77mg/L, July 12, 2014; minimum, <0.01 mg/L, many days. 
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 0.95 ft. To convert data to MHHW datum subtract 2.20 ft. To convert data to MLLW datum add 1.13 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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