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 analysis.

 

NOTICE: This continuous water-quality monitor (water temperature, chlorophyll, and phycocyanin) will be discontinued on September 1, 2021, due to completion of the data collection portion of the Downstream Fate and Transport of Cyanobacteria and Cyanotoxins in the Raritan River Basin, New Jersey study.

SURFACE-WATER RECORDS
LOCATION.--Lat 40°19'59", long 74°40'55" referenced to North American Datum of 1983, Princton Township, Mercer County, NJ, Hydrologic Unit 02030105, on right bank, 10 ft downstream from bridge on U.S. Highway 206, 1.6 mi southwest of Princeton, and 4.0 mi upstream from Carnegie Lake.
DRAINAGE AREA.--44.5 mi².
PERIOD OF RECORD.--Continuous-record discharge station, October 1953 to current year.
GAGE.--Water-stage recorder with telemetry, crest-stage gage, and concrete control. Datum of gage is 62.23 ft above NGVD of 1929 (levels from New Jersey Geological Survey benchmark).
REMARKS.--Records fair, except for estimated discharges, which are poor. Since July 1959 some regulation by several small reservoirs, combined capacity, 49,800,000 gal. Discharges above 5,100 ft³/s from rating extension on basis of contracted-opening measurement of peak flow.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 10,600 ft³/s, Aug 28, 2011, gage height, 16.23 ft, from rating curve extended above 5,100 ft³/s on basis of contracted-opening measurement of peak flow at gage height 14.26 ft; minimum discharge, 0.0 ft³/s, Aug 5, 1966.

Peak Flood Chart

National Weather Service flood stage for this gage is 9 ft.