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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.

USGS 01400000 North Branch Raritan River near Raritan NJ


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National Weather Service flood stage for this gage is 10.0 ft.

Forecasts for this gage are issued by the National Weather Service routinely year-round.
Forecast information is available here.

gage photo LOCATION.--Lat 40°34'14", long 74°40'45" referenced to North American Datum of 1983, Branchburg Township, Somerset County, NJ, Hydrologic Unit 02030105, on right bank, 400 ft upstream from U.S. Route 202, 1.4 mi upstream from confluence with South Branch Raritan River, and 2.7 mi west of Raritan.
DRAINAGE AREA.--190 mi2.
PERIOD OF RECORD.--June 1923 to current year. Monthly discharge only for June 1923, published in WSP 1302. Prior to October 1943, published as "at Milltown".
GAGE.--Water-stage recorder. Concrete control since Sep 1, 1936. Datum of gage is 50.43 ft above NGVD of 1929. Prior to Oct 17, 1936, nonrecording gage at site 30 ft downstream at same datum. Occasionally reservoir releases from Round Valley Reservoir are included in the flow at this gage.
COOPERATION.--Funding for this gage is provided by the New Jersey Water Supply Authority, the New Jersey Department of Environmental Protection, and the U.S. Geological Survey.

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This station managed by the New Jersey Water Science Center.

Available Parameters Available Period
All 2 Available Parameters for this site
00060 Discharge 2007-10-01  2016-09-25
00065 Gage height 2007-10-01  2016-09-25

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Instantaneous-data availability statement

Discharge, cubic feet per second

Most recent instantaneous value: 183   09-25-2016   01:15 EDT
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Daily discharge, cubic feet per second -- statistics for Sep 25 based on 91 years of record more
Median 75th
Most Recent
Value Sep 25
Mean Max
8.1 51 78 142 183 199 5110

Gage height, feet

Most recent instantaneous value: 2.89   09-25-2016   01:15 EDT
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