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:
Lat 40°16'11", long 74°40'19"
referenced to North American Datum of 1983, Lawrence Township, Mercer
County, NJ, Hydrologic Unit 02040105, on left bank 250 ft upstream from
bridge on Quaker Bridge Road (County Route 533), 0.7 mi downstream from
dam at Lake Mercer, 1.9 mi south of Clarksville, 2.0 mi upstream from
Shipetaukin Creek, and 7.6 mi upstream from mouth.
PERIOD OF RECORD.--
Occasional low-flow measurements, water years
1963-67. Continuous-record discharge station, water years 1973-81 and
March 1992 to current year. Continuous-record discharge station for
growing season only (April through October), water years
Water-stage recorder with telemetry and crest-stage gage.
Datum of gage is 49.28 ft above NGVD of 1929.
Records fair, except for estimated discharges, which
are poor. Regulation from several flood-control dams since the late
1970's and from ponds upstream. Diversions for irrigation upstream
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 1,250
/s, Aug 29, 2011, gage height, 9.74 ft; minimum
discharge, 0.88 ft3
/s, Sep 11, 2010.
EXTREMES OUTSIDE PERIOD OF RECORD.--
Flood of Aug 28, 1971
reached a stage of 10.9 ft, discharge, 1,500 ft3
National Weather Service flood stage for
this gage is 8 ft.