Ramapo River near Mahwah, Bergen County NJ (MAWN4)
Gage Location: Bergen County, New JerseySite Location: Bergen County, New Jersey
Latitude: 41.098Longitude: -74.163Elevation: 253.1 ft. MSLDrainage Area: 120 Sq. Mi.
Minor Stage: 8 ft. Moderate Stage: 9 ft.Major Stage: 12 ft.
First Flood: 1903-10-09Last Flood: 2012-12-21 Crest: 6.39 ft.Datum change: 1936-12-24Number of Floods: 102

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1903-10-091112400ModerateC1 F4 G1
1910-01-228.45200MinorC1 G1
1927-09-028.235140MinorC1 G1
1933-08-248.45650MinorC1 G1
1936-03-1297780ModerateC1 G1
1937-02-228.052500Minornone
1938-01-258.152620Minornone
1938-09-2210.46720Moderatenone
1938-12-068.062480Minornone
1945-07-198.673350Minornone
1945-07-239.254330Moderatenone
1948-12-319.184200Moderatenone
1951-03-3110.676940Moderatenone
1951-12-218.142610Minornone
1952-03-129.184150Moderatenone
1952-04-058.092550Minornone
1952-06-029.053940Moderatenone
1952-11-2382440Minornone
1953-01-258.072520Minornone
1955-08-139.534740Moderatenone
1955-08-1911.358580Moderatenone
1955-10-1612.5310900Majornone
1957-12-219.333800Moderatenone
1958-02-288.392510Minornone
1958-04-078.142240Minornone
1960-04-058.072170Minornone
1960-08-209.13450Moderatenone
1960-09-138.482620Minornone
1961-02-268.873120Minornone
1962-03-138.252360Minornone
1968-05-2911.878770Moderatenone
1969-03-2593000Moderatenone
1969-12-118.12100Minornone
1970-02-038.52500Minornone
1970-02-118.892890Minornone
1970-04-029.253380Moderatenone
1971-08-2810.766700Moderatenone
1971-09-129.624800Moderatenone
1972-03-038.022100Minornone
1972-06-238.552630Minornone
1972-11-088.812890Minornone
1973-02-039.774340Moderatenone
1973-06-308.12180Minornone
1973-12-2110.56050Moderatenone
1975-03-208.442500Minornone
1975-07-148.032100Minornone
1975-09-278.852940Minornone
1976-01-288.652740Minornone
1977-02-258.93030Minornone
1977-03-239.654100Moderatenone
1977-11-0812.4411800Majornone
1978-01-098.522570Minornone
1978-01-268.172210Minornone
1978-03-278.893030Minornone
1978-05-159.113350Moderatenone
1979-01-218.342380Minornone
1979-01-259.94750Moderatenone
1979-03-078.662740Minornone
1979-05-258.762900Minornone
1980-03-2210.76520Moderatenone
1980-04-1010.435880Moderatenone
1981-02-209.063270Moderatenone
1981-05-128.472520Minornone
1982-01-058.42520Minornone
1983-03-199.764480Moderatenone
1983-03-218.212310Minornone
1983-04-178.32410Minornone
1983-12-1310.285540Moderatenone
1984-04-0513.3512100Majornone
1984-05-309.373780Moderatenone
1986-08-038.273370Minornone
1987-04-059.966410Moderatenone
1989-05-068.33510Minornone
1989-05-179.365230Moderatenone
1989-10-218.674060Minornone
1995-11-128.884330Minornone
1996-01-208.834250Minornone
1996-01-288.693420Minornone
1996-07-148.473160Minornone
1996-10-208.593300Minornone
1996-12-028.152810Minornone
1998-05-118.013340Minornone
1999-03-228.353022Minornone
1999-09-1612.5211000Majornone
2003-12-118.84200Minornone
2003-12-258.173552Minornone
2004-09-188.453640Minornone
2005-04-039.876220Moderatenone
2005-10-099.65910Moderatenone
2005-10-139.856170Moderatenone
2007-04-1610.998870Moderatenone
2008-12-128.073090Minornone
2010-03-1411.910200Moderatenone
2010-03-308.093120Minornone
2011-03-0711.169320Moderatenone
2011-03-1110.728180Moderatenone
2011-04-179.555520Moderatenone
2011-06-238.733540Minornone
2011-08-2815.7715000Majornone
2011-09-089.545040Moderatenone
2011-12-088.362140Minornone
2012-12-216.392030Minornone



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: 07:20 AM Nov 12, 2013