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: 2014-05-01 Crest: 8.15 ft.Datum change: 1936-12-24Number of Floods: 103

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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
2012-12-218.523030Minornone
2014-05-018.152870Minornone



Codes and description

C1|Crest information during this period may be incomplete and therefore was not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information during this period 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: 07:31 AM Dec 19, 2014