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.

 

SURFACE-WATER RECORDS
LOCATION.--Lat 40°26'24", long 74°37'03" referenced to North American Datum of 1983, Montgomery Township, Somerset County, NJ, Hydrologic Unit 02030105, on left bank, 300 ft downstream from bridge at Griggstown, 200 ft downstream from Simonson Brook, and 300 ft downstream from Griggstown Causeway.
DRAINAGE AREA.--229 mi².
PERIOD OF RECORD.--Annual maximum, water years 1938, 1960-61, 1971, 1997, 1999 to current year. Miscellaneous measurements, water year 1969.
GAGE.--Water-stage recorder with telemetry and crest-stage gage. Datum of gage is 26.52 ft above NGVD of 1929.
REMARKS.--Diurnal fluctuations in gage height possibly due to flow pattern in sewage effluent that enter the river upstream of gage. Annual peak data can be obtained by selecting Peak streamflow from the 'Available data for this site' drop-down menu above or by using this link.
EXTREMES FOR PERIOD OF RECORD.--Maximum gage height, 24.20 ft, Aug 28, 2011.

Peak Flood Chart

National Weather Service flood stage for this gage is 10 ft.

The water temperature data for this station are temporary and will only be displayed for 120 days. Although the instrumentation is calibrated at least once/year, the temporary classification means that documented routine inspections and other quality assurance measures are not performed that would make the data acceptable for archival, retrieval, or future use in general scientific or interpretive studies.