During winter months, cold and ice may
result in inaccurate real-time gage height and streamflow data.
Adjustments or deletions of this data can only be done after detailed
Funding for this site is provided by:
40°35'06", long 74°30'28" referenced to North
American Datum of 1983, Green Brook Township, Somerset County, NJ,
Hydrologic Unit 02030105, on downstream right wingwall of bridge on
Sebrings Mills Road (Greenbrook Road) at Middlesex, 0.4 mi downstream
of mouth of Green Brook, and 2.3 mi upstream of mouth.
PERIOD OF RECORD.--
June 1972 to September 1977, April 1996 to
September 1998, February 2004 to September 2011 and February 2013 to
current. Prior to October 1977, located on right bank, 107 ft upstream
of bridge on Sebrings Mill Road, published as "Green Brook at
Middlesex, NJ." Operated as a crest-stage partial-record station
water years 1992 to 1995, and 1999 to 2003.
WDR US-2011: 1996(M), 1997(M), 1999(M),
Water-stage and precipitation recorder with telemetry and
crest-stage gage. Datum of gage is 26.52 ft above NGVD of 1929.
Continuous gage 1972-77 at site 130 ft upstream, datum at NGVD of
Records good, except for estimated discharges, which
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge 7,000
/s, Aug 2, 1972, gage height, 41.18 ft, site and datum
then in use; minimum discharge, 2.5 ft3
/3, Jul 21,
PERIOD OF RECORD1.--
Water years 1974, 1996-98, 2001
to current year.
Samples were collected as part of the Long
Island-New Jersey National Water Quality Assessment Program (LINJ
1 Water-Quality Records
Rain gage data is available from this location at this