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

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1903-10-09 11.03 12400 Moderate *** (5) 1910-01-22 8.4 5200 Minor *** (5) 1927-09-02 8.23 5140 Minor *** (5) 1933-08-24 8.4 5650 Minor *** (5) 1936-03-12 9 7780 Moderate *** (5) 1937-02-22 8.05 2500 Minor none 1938-01-25 8.15 2620 Minor none 1938-09-22 10.4 6720 Moderate none 1938-12-06 8.06 2480 Minor none 1945-07-19 8.67 3350 Minor none 1945-07-23 9.25 4330 Moderate none 1948-12-31 9.18 4200 Moderate none 1951-03-31 10.67 6940 Moderate none 1951-12-21 8.14 2610 Minor none 1952-03-12 9.18 4150 Moderate none 1952-04-05 8.09 2550 Minor none 1952-06-02 9.05 3940 Moderate none 1952-11-23 8 2440 Minor none 1953-01-25 8.07 2520 Minor none 1955-08-13 9.53 4740 Moderate none 1955-08-19 11.35 8580 Moderate none 1955-10-16 12.53 10900 Major none 1957-12-21 9.33 3800 Moderate none 1958-02-28 8.39 2510 Minor none 1958-04-07 8.14 2240 Minor none 1960-04-05 8.07 2170 Minor none 1960-08-20 9.1 3450 Moderate none 1960-09-13 8.48 2620 Minor none 1961-02-26 8.87 3120 Minor none 1962-03-13 8.25 2360 Minor none 1968-05-29 11.87 8770 Moderate none 1969-03-25 9 3000 Moderate none 1969-12-11 8.1 2100 Minor none 1970-02-03 8.5 2500 Minor none 1970-02-11 8.89 2890 Minor none 1970-04-02 9.25 3380 Moderate none 1971-08-28 10.76 6700 Moderate none 1971-09-12 9.62 4800 Moderate (3) 1972-03-03 8.02 2100 Minor none 1972-06-23 8.55 2630 Minor none 1972-11-08 8.81 2890 Minor none 1973-02-03 9.77 4340 Moderate none 1973-06-30 8.1 2180 Minor none 1973-12-21 10.5 6050 Moderate none 1975-03-20 8.44 2500 Minor none 1975-07-14 8.03 2100 Minor none 1975-09-27 8.85 2940 Minor none 1976-01-28 8.65 2740 Minor none 1977-02-25 8.9 3030 Minor none 1977-03-23 9.65 4100 Moderate none 1977-11-08 12.44 11800 Major none 1978-01-09 8.52 2570 Minor none 1978-01-26 8.17 2210 Minor none 1978-03-27 8.89 3030 Minor none 1978-05-15 9.11 3350 Moderate none 1979-01-21 8.34 2380 Minor none 1979-01-25 9.9 4750 Moderate none 1979-03-07 8.66 2740 Minor none 1979-05-25 8.76 2900 Minor none 1980-03-22 10.7 6520 Moderate none 1980-04-10 10.43 5880 Moderate none 1981-02-20 9.06 3270 Moderate none 1981-05-12 8.47 2520 Minor none 1982-01-05 8.4 2520 Minor none 1983-03-19 9.76 4480 Moderate none 1983-03-21 8.21 2310 Minor none 1983-04-17 8.3 2410 Minor none 1983-12-13 10.28 5540 Moderate none 1984-04-05 13.35 15500 Major none 1984-05-30 9.37 3780 Moderate none 1986-08-03 8.27 3370 Minor none 1987-04-05 9.96 6410 Moderate none 1989-05-06 8.3 3510 Minor none 1989-05-17 9.36 5230 Moderate none 1989-10-21 8.67 4060 Minor none 1995-11-12 8.88 4330 Minor none 1996-01-20 8.83 4250 Minor none 1996-01-28 8.69 3420 Minor none 1996-07-14 8.47 3160 Minor none 1996-10-20 8.59 3300 Minor none 1996-12-02 8.15 2810 Minor none 1998-05-11 8.01 3340 Minor none 1999-03-22 8.35 3022 Minor none 1999-09-16 12.52 13800 Major none 2003-12-11 8.8 4200 Minor none 2003-12-25 8.17 3552 Minor none 2004-09-18 8.45 3640 Minor none 2005-04-03 9.87 6220 Moderate none 2005-10-09 9.6 5910 Moderate none 2005-10-13 9.85 6170 Moderate none 2007-04-16 10.99 8870 Moderate none 2008-12-12 8.07 3090 Minor none 2010-03-14 11.9 11500 Moderate none 2010-03-30 8.09 3120 Minor none 2011-03-07 11.16 9320 Moderate none 2011-03-11 10.72 8180 Moderate none 2011-04-17 9.55 5520 Moderate none 2011-06-23 8.73 3540 Minor none 2011-08-28 15.77 17600 Major none 2011-09-08 9.54 5040 Moderate none 2011-12-08 8.36 2140 Minor 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