USGS Water-Year Summary 2024
01304562 PECONIC RIVER AT COUNTY HIGHWAY 105 AT RIVERHEAD, NY
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.
SURFACE-WATER RECORDS
PERIOD OF RECORD - August 2012 to current year.
GAGE - Water-stage recorder. Datum of gage is NGVD of 1929.
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.
EXTREMES FOR PERIOD OF RECORD - Maximum elevation, 8.56 ft, Oct. 29, 2012; minimum elevation, -3.59 ft, Jan. 5, 2018.
WATER-QUALITY RECORDS
PERIOD OF RECORD - August 2012 to current year.
PERIOD OF DAILY RECORD - 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.
INSTRUMENTATION - Water-quality monitor provides 6-minute-interval readings collected from 1.6 ft above bottom. Salinity record computed from specific-conductance readings.
EXTREMES FOR PERIOD OF RECORD - 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. 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.