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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MINOR FLOODS
Date of FloodCrest(ft)
1910-01-228.4
1927-09-028.23
1933-08-248.4
1937-02-228.05
1938-01-258.15
1938-12-068.06
1945-07-198.67
1951-12-218.14
1952-04-058.09
1952-11-238
1953-01-258.07
1958-02-288.39
1958-04-078.14
1960-04-058.07
1960-09-138.48
1961-02-268.87
1962-03-138.25
1969-12-118.1
1970-02-038.5
1970-02-118.89
1972-03-038.02
1972-06-238.55
1972-11-088.81
1973-06-308.1
1975-03-208.44
1975-07-148.03
1975-09-278.85
1976-01-288.65
1977-02-258.9
1978-01-098.52
1978-01-268.17
1978-03-278.89
1979-01-218.34
1979-03-078.66
1979-05-258.76
1981-05-128.47
1982-01-058.4
1983-03-218.21
1983-04-178.3
1986-08-038.27
1989-05-068.3
1989-10-218.67
1995-11-128.88
1996-01-208.83
1996-01-288.69
1996-07-148.47
1996-10-208.59
1996-12-028.15
1998-05-118.01
1999-03-228.35
2003-12-118.8
2003-12-258.17
2004-09-188.45
2008-12-128.07
2010-03-308.09
2011-06-238.73
2011-12-088.36
 MODERATE FLOODS
Date of FloodCrest(ft)
1903-10-0911
1936-03-129
1938-09-2210.4
1945-07-239.25
1948-12-319.18
1951-03-3110.67
1952-03-129.18
1952-06-029.05
1955-08-139.53
1955-08-1911.35
1957-12-219.33
1960-08-209.1
1968-05-2911.87
1969-03-259
1970-04-029.25
1971-08-2810.76
1971-09-129.62
1973-02-039.77
1973-12-2110.5
1977-03-239.65
1978-05-159.11
1979-01-259.9
1980-03-2210.7
1980-04-1010.43
1981-02-209.06
1983-03-199.76
1983-12-1310.28
1984-05-309.37
1987-04-059.96
1989-05-179.36
2005-04-039.87
2005-10-099.6
2005-10-139.85
2007-04-1610.99
2010-03-1411.9
2011-03-0711.16
2011-03-1110.72
2011-04-179.55
2011-09-089.54
 MAJOR FLOODS
Date of FloodCrest(ft)
1955-10-1612.53
1977-11-0812.44
1984-04-0513.35
1999-09-1612.52
2011-08-2815.77
 MISSING
Date of FloodCrest(ft)



Categorical Floods by Month
MonthMinor
After
Datum		Minor
Total		Moderate
After
Datum		Moderate
Total		Major
After
Datum		Major
Total		Missing
After
Datum		Missing
Total
January910110000
February66220000
March889100000
April44661100
May44440000
June33110000
July33110000
August12441100
September34331100
October22231100
November33001100
December99440000


Categorical Floods by Season
SeasonMinorModerateMajorMissing
Fall9630
Winter25700
Spring162010
Summer8610


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