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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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1896-02-06 -9999 19000 Missing *** 1927-11-03 10 10500 Minor *** 1933-09-15 10 10500 Minor *** 1934-09-30 10.6 12200 Minor *** 1936-01-03 11.35 14400 Minor *** 1936-03-12 10.5 11900 Minor *** 1938-09-21 12.16 16500 Moderate none 1940-03-15 11.62 15100 Minor none 1942-08-09 11.78 15500 Minor none 1942-08-14 11.33 14200 Minor none 1946-06-02 10.18 11000 Minor none 1948-12-30 11.25 14000 Minor none 1951-11-07 10.63 10900 Minor none 1955-08-13 12.7 17400 Moderate none 1955-08-19 13.59 20700 Moderate none 1955-10-15 12.68 17300 Moderate none 1965-02-08 10.49 10600 Minor none 1968-05-29 10.34 10700 Minor none 1970-04-03 10.49 11200 Minor none 1971-08-28 15.47 28600 Major none 1972-06-22 10.22 10400 Minor none 1973-08-02 10.44 10900 Minor none 1973-12-21 10.42 10900 Minor none 1975-07-21 10.44 10900 Minor none 1979-01-25 11.87 15100 Minor none 1980-03-21 10.68 11600 Minor none 1981-05-12 10.63 11400 Minor none 1982-01-04 10.24 10400 Minor none 1982-02-03 11.68 14500 Minor none 1983-04-16 11.59 14200 Minor none 1984-04-05 10.79 11900 Minor none 1984-07-07 15.3 27900 Major (1) 1994-01-29 10.19 10000 Minor none 1996-01-19 14.3 23700 Moderate none 1996-10-19 15.44 28500 Major none 1999-09-16 18.98 29000 Major none 2003-12-11 10.17 10230 Minor none 2004-02-07 11.32 13405 Minor none 2004-07-23 11.95 14600 Minor none 2004-09-29 10.48 10000 Minor none 2005-04-03 10.34 9690 Minor none 2005-10-09 10.88 11200 Minor none 2006-06-28 10.71 10700 Minor none 2007-03-02 10.27 9510 Minor none 2007-04-16 13.21 19500 Moderate none 2008-02-13 10.62 10500 Minor none 2008-03-08 11.43 12900 Minor none 2008-12-12 10.58 10400 Minor none 2010-03-14 13.9 22200 Moderate none 2011-03-07 10.01 8840 Minor none 2011-04-17 11.15 11500 Minor none 2011-08-28 17.97 40600 Major none 2011-09-07 10.11 8240 Minor none 2011-09-08 12.72 17500 Moderate none

MARFC Codes
Code Description
(!!!) Datum changed during this year.
(1) Backwater Effect.
(2) 15.77 ft also occurred on 11/25/1950 but only counted as one flood.
(3) Estimated from currrent USGS rating table.
(4) Estimated height from the USGS.
(5) Gage height at a different site and/or datum
(6) Discharge affected by Regulation or Diversion
(7) Due to changes, prior floods were based on present flood stage. Therefore, flood data could possibly be incomplete.
(8) Gage is a staff gage and not the offical USGS gage. Therefore, some floods may be missing from our study.
(9) Discharge effected by snow-melt, ice jam or debris jam break up
(A) Discharge affected to unknown degree by regulation or diversion.
(B) Month or day of occurrence is unknown or not exact.
(C) All or part of the record affected by urbanization, mining, agricultural changes, channelization, or other factors.
(D) Crest height adjusted to current datum.
(E) Estimated discharge.
(F) Only annual maximum peak available for this year.
(O) This flood occurred at a previous flood stage that is lower than the current flood stage. This is only a historical flood.
** Crest information looks reasonable despite potential problems. This data was used in our study.
*** Crest information looks unreliable and incomplete and was not used in our flood frequency study.
**** Gauge was discontinued in 2004. 2004 and later was not used in our study.
none No code

Updated: 08:58 AM Jun 28, 2012