LOCATION.--Lat 40°50'58", long
73°13'27" referenced to North American Datum of 1983,
Suffolk County, NY, Hydrologic Unit 02030201, on left bank 0.5
mi downstream from New Mill Pond, 1.0 mi southwest of
Smithtown, and 1.5 mi southwest of Village of Smithtown
Branch.
DRAINAGE AREA.--27 mi².
PERIOD OF RECORD.--October 1943 to current year.
REVISIONS HISTORY.--WSP 1141: Drainage area.
GAGE.--Water-stage recorder and concrete control. Datum
of gage is 9.59 ft above NGVD of 1929 and 8.52 ft above NAVD of
1988 (VERTCON).
REMARKS.--Occasional regulation caused by cleaning of
fish screens and trash racks at outlet of New Mill Pond on main
stream and ponds on tributaries above station. Satellite
gage-height telemeter at station.
Water years 2014-19: Records good except those for estimated
daily discharges, which are fair.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 952
ft³/s, Jan. 22, 1979, gage height, 3.22 ft, result of dam
failure; minimum discharge, 16 ft³/s, June 5, 6, 1967; minimum
gage height, 0.46 ft, Feb. 9, 1951.
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