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°08'14", long 74°36'00"
referenced to North American Datum of 1983, Hamilton Township, Mercer
County, NJ, Hydrologic Unit 02040201, on right bank upstream from
bridge on Extonville Road, 0.5 mi south of Extonville, 0.5 mi upstream
from Pleasant Run, and 0.7 mi downstream from Mercer-Monmouth County
PERIOD OF RECORD.--
Continuous-record discharge station, August
1940 to October 1951, October 1952 to current year.
WDR NJ-79-2: 1971(M). WDR NJ-82-2: Drainage
Water-stage recorder with telemetry, crest-stage gage,
and concrete control. Datum of gage is 24.94 ft above NGVD of
Records fair, except for estimated discharges, which
are poor. Flow regulated occasionally by lakes above station.
EXTREMES FOR PERIOD OF RECORD.--
Maximum discharge, 5,940
/s, Aug 28, 2011, gage height, 17.10 ft, from high-water
mark in gage house; minimum discharge, 5.8 ft3
/s, Aug 22,
EXTREMES OUTSIDE PERIOD OF RECORD.--
Flood of Sep 22, 1938
reached a stage of 13.0 ft (from information from local residents),
discharge, 4,100 ft3
National Weather Service flood stage for
this gage is 12 ft.