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- Water-Year Summary reports summarize a year of hydrologic data in a printer-friendly format.
- For water years 2014 onward, choose a water year and parameter and an on-demand Water-Year Summary report will be generated.
- For water years 2006 through 2013, choose a water year and an Annual Water Data Report will be provided.
- For water years 2005 and earlier, Annual Water Data Reports may be available in digital format.
- Not all sites have reports available for every water year.
USGS Water-Year Summary 2024
01304500 PECONIC RIVER AT RIVERHEAD, NY
LOCATION - Lat 40°54'49.3", long 72°41'13.0" referenced to North American Datum of 1983, Suffolk County, NY, Hydrologic Unit 02030202, on right bank 200 ft downstream from Long Island Power Authority dam, 0.4 mi west of Riverhead, and 1.2 mi upstream from outlet of Sweezy Pond.
DRAINAGE AREA - 74.7 mi².
REVISIONS HISTORY - WDR-US-2009: Drainage area.
SURFACE-WATER RECORDS
PERIOD OF RECORD - June 1942 to current year.
GAGE - Water-stage recorder and concrete control. Datum of gage is 6.54 ft above NGVD of 1929 and 5.58 ft above NAVD of 1988 (VERTCON).
REMARKS - Flow regulated by ponds above station.
Water Years 2014-23: Records good except those for estimated daily discharges, which are fair.
Water Years 2014-23: Records good except those for estimated daily discharges, which are fair.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 225 ft³/s, Jan. 30, 1978, gage height, 1.20 ft, result of regulation; maximum gage height, 2.33 ft, Dec. 11, 1992, result of storm tide; minimum discharge, 1.4 ft³/s, Jan. 9, 1966, Jan. 31, 1967, Dec. 6, 1969, Jan. 27, 1972, Dec. 10, 11, 1977, all result of freezeup; minimum gage height, 0.07 ft, Feb. 10, 2017, result of freezeup.
