North Branch Raritan River near Raritan, Somerset County NJ (RRTN4)
Gage Location: Somerset County, New Jersey	Site Location: Somerset County, New Jersey
Latitude: 40.571	Longitude: -74.679	Elevation: 50.43 ft. MSL	Drainage Area: 190 Sq. Mi.
Minor Stage: 10 ft.	Moderate Stage: 12 ft.	Major Stage: 15 ft.
First Flood: 1896-02-06	Last Flood: 2011-09-08 Crest: 12.72 ft.	Datum change: 1936-10-17	Number of Floods: 54

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MINOR FLOODS Date of Flood Crest(ft) 1927-11-03 10 1933-09-15 10 1934-09-30 10.6 1936-01-03 11.35 1936-03-12 10.5 1940-03-15 11.62 1942-08-09 11.78 1942-08-14 11.33 1946-06-02 10.18 1948-12-30 11.25 1951-11-07 10.63 1965-02-08 10.49 1968-05-29 10.34 1970-04-03 10.49 1972-06-22 10.22 1973-08-02 10.44 1973-12-21 10.42 1975-07-21 10.44 1979-01-25 11.87 1980-03-21 10.68 1981-05-12 10.63 1982-01-04 10.24 1982-02-03 11.68 1983-04-16 11.59 1984-04-05 10.79 1994-01-29 10.19 2003-12-11 10.17 2004-02-07 11.32 2004-07-23 11.95 2004-09-29 10.48 2005-04-03 10.34 2005-10-09 10.88 2006-06-28 10.71 2007-03-02 10.27 2008-02-13 10.62 2008-03-08 11.42 2008-12-12 10.57 2011-03-07 10.01 2011-04-17 11.15 2011-09-07 10.11

MODERATE FLOODS Date of Flood Crest(ft) 1938-09-21 12.16 1955-08-13 12.7 1955-08-19 13.59 1955-10-15 12.68 1996-01-19 14.3 2007-04-16 13.21 2010-03-14 13.9 2011-09-08 12.72

MAJOR FLOODS Date of Flood Crest(ft) 1971-08-28 15.47 1984-07-07 15.3 1996-10-19 15.44 1999-09-16 18.98 2011-08-28 17.96

MISSING Date of Flood Crest(ft) 1896-02-06 -9999

Categorical Floods by Month Month Minor After Datum Minor Total Moderate After Datum Moderate Total Major After Datum Major Total Missing After Datum Missing Total January 3 4 1 1 0 0 0 0 February 4 4 0 0 0 0 0 1 March 5 6 1 1 0 0 0 0 April 5 5 1 1 0 0 0 0 May 2 2 0 0 0 0 0 0 June 3 3 0 0 0 0 0 0 July 2 2 0 0 1 1 0 0 August 3 3 2 2 2 2 0 0 September 2 4 2 2 1 1 0 0 October 1 1 1 1 1 1 0 0 November 1 2 0 0 0 0 0 0 December 4 4 0 0 0 0 0 0

Categorical Floods by Season Season Minor Moderate Major Missing Fall 7 3 2 0 Winter 12 1 0 1 Spring 13 2 0 0 Summer 8 2 3 0

Codes and description

C1|Crest information looks unreliable and incomplete and not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information looks reliable despite potential problems. This data was used in frequency calculations.
C3|Crest height estimated by the USGS.
C4|Crest height is from the National Weather Service.
C5|Crest height affected by backwater.
C6|Crest occurred at a previous flood stage that is lower than the current flood stage. The crests below the new flood stage are not used in flood frequency calculations.
C7|Crest from USGS yearly peak and/or date is different than the crest we provide. In many cases MARFC uses crest based on backwater or ice effects.
C8|Crest month or day of occurrence has been estimated by The Middle Atlantic River Forecast Center usually based on nearby gage information.
C9|Crest date (day) in the month is unknown.
F1|Flow is an estimate.
F2|Flow affected by regulation or diversion and in some cases to an unknown degree.
F3|Flow effected by snow-melt, ice jam or debris jam break up.
F4|Flow affected by dam failure.
F5|Flow - All or part of the record affected by urbanization, mining, agricultural changes, channelization or other factors.
G1|Gage height at a different site and/or datum.
G2|Gage is not an official USGS gage with crests provided by the NWS. Crest information looks unreliable and incomplete and not used in flood frequency calculations.
G3|Gage datum changed during this year.
none,No code; Good Data

Updated: 08:09 AM Feb 08, 2013