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LOCATION.--Lat
40°54'49", long 72°41'12" 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.
PERIOD OF RECORD.--June 1942 to current year.
REVISIONS HISTORY.--WDR-US-2009: Drainage area.
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 2014-18: 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.
Peak Flow and Stage Information
Station image