LOCATION.--Lat 40°57'46.3", long 73°08'35.4" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030201, on foot bridge in Flax Pond State Tidal Wetlands, in Old Field.
PERIOD OF RECORD.--December 2007 to May 2019, August 2022 to current year.
REVISIONS HISTORY.--Dissolved oxygen records for the period Aug. 8 to 19, 2022 and Dec. 29, 2022 to Jan. 11, 2023, were deleted on Aug. 28, 2023, due to an equipment calibration issue.
GAGE.--Water-stage recorder. Datum of gage is NGVD of 1929.
REMARKS.--Satellite telemeter for elevation at station.  Gaps in record caused by equipment malfunctions are filled with estimated data from nearby gage 01302600 West Pond at Glen Cove, NY and 01302845 Frost Creek at Sheep LN Bridge at Lattingtown, NY.
EXTREMES FOR PERIOD OF RECORD.--Maximum elevation, 10.35 ft, Oct. 29 2012; minimum elevation, -0.15 ft, Mar. 2, 2015.
EXTREMES OUTSIDE PERIOD OF RECORD.--Storm tide of Dec. 11, 1992, reached an elevation of 9.9 ft, from high-water mark at site 1.1 mi southeast.
PERIOD OF RECORD¹.--December 2007 to May 2019, August 2022 to current year. Sampling depth records for December 2007 to current year are unpublished and available in files of the Geological Survey.
PERIOD OF DAILY RECORD¹.--WATER TEMPERATURE: December 2007 to May 2019, August 2022 to current year. SALINITY: December 2007 to May 2019, August 2022 to current year. DISSOLVED OXYGEN: April 2008 to April 2011, October 2013 to May 2019, August 2022 to current year. pH: April 2008 to May 2019, August 2022 to current year. TURBIDITY: April 2008 to April 2011, October 2013 to May 2019, August 2022 to current year.
INSTRUMENTATION¹.--Water-quality monitor provides 6-minute-interval readings collected from 1.6 ft above bottom. December 2007 to April 2008, water-quality monitor readings collected from 0.5 ft above bottom. Salinity record computed from specific-conductance readings.
REMARKS¹.--Satellite telemeter for water temperature, specific conductance, dissolved oxygen, pH, turbidity, and sampling depth parameters at station. Station discontinued from April 2011 to October 2013.  Station moved to new walking bridge from April 2018 to January 2019. Station discontinued from May 2019 to August 2022.
EXTREMES FOR PERIOD OF RECORD¹.--WATER TEMPERATURE: Maximum, 33.6 °C, July 7, 2010; minimum, -1.8 °C on many days during the winter period.
SALINITY: Maximum, 39.4 psu, Jan. 08, 2018; minimum, 13.5 psu, Nov. 8, 2023.
DISSOLVED OXYGEN: Maximum, 19.3 mg/L, Jan. 9, 2014; minimum, 0.8 mg/L, Aug. 13, 15, 2016.
pH: Maximum, 8.7 standard units, Jan. 18, 2023; minimum, 6.7 standard units, Aug. 12-13, 2012.
TURBIDITY: Maximum, 780 FNU, Jan. 23, 2016; minimum, <0.1 FNU several days each year 2008-18.
CHLOROPHYLL: Maximum, 388.1 ug/L, 94.33 RFU, June 25, 2023; minimum, 0.02 ug/L on many days during 2023 winter period.
PHYCOERYTHRIN: Maximum, 486 ug/L, 172 RFU, May 12, 2023; minimum, 0.12 ug/L, Dec. 6, 2023, 0.06 RFU, Dec. 6, 7, 2023.

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 1.08 ft. To convert data to MHHW datum subtract 4.56 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.

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Water elevation, astronomical-tide elevation, and residual water level Graph updated every 15 minutes

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