USGS Water-Year Summary for Site 01304057

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Mean)
	00095 Specific cond at 25C(Max.,Min.,Mean)
	00300 Dissolved oxygen(Max.,Min.,Mean)
	00400 pH(Max.,Min.,Med.)
	62619 Elevation, ocean/est, NGVD29(Mean,Tid.,Tid.,Tid.,Tid.)
	63680 Turbidity, Form Neph(Min.,Mean,Max.)
	63680 Turbidity, Form Neph(Min.,Max.,Mean) [from EXO]
	90860 Salinity, at 25C(Max.,Min.,Mean)

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Water year 2024: 2024-10-01 to 2025-09-30

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USGS Water-Year Summary 2024

01304057 FLAX POND AT OLD FIELD, NY

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.

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.

SURFACE-WATER RECORDS

PERIOD OF RECORD - December 2007 to May 2019, August 2022 to current year.

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 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.

EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 10.35 ft, Oct. 29 2012; minimum elevation, -0.15 ft, Mar. 2, 2015.

WATER-QUALITY RECORDS

PERIOD OF RECORD - 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 Sampling depth records for December 2007 to current year are unpublished and available in files of the Geological Survey.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 RECORD - 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.

INSTRUMENTATION - 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.

REMARKS - 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 RECORD - 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.