Pequannock River at Macopin Intake Dam, Passaic County NJ (MCPN4)
Gage Location: Passaic County, New Jersey	Site Location: Passaic County, New Jersey
Latitude: 41.018	Longitude: -74.402	Elevation: 549.17 ft. MSL	Drainage Area: 64 Sq. Mi.
Minor Stage: 5.5 ft.	Moderate Stage: 6.5 ft.	Major Stage: 7.5 ft.
First Flood: 1903-10-10	Last Flood: 2012-12-21 Crest: 8.52 ft.	Datum change: 1992-09-01	Number of Floods: 38

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MINOR FLOODS Date of Flood Crest(ft) 1993-03-29 5.82 1994-03-24 5.53 1996-01-19 6.31 1998-05-11 5.97 2001-03-22 5.8 2003-03-25 6.31 2003-06-01 5.57 2003-12-12 5.78 2005-03-29 5.59 2005-04-03 6.12 2006-01-19 5.68 2007-04-16 6.38 2008-02-14 5.54 2008-03-09 5.67 2010-01-26 5.53 2010-03-31 5.59 2011-03-07 5.93 2011-04-17 5.73 2011-05-19 5.65 2011-06-24 5.6 2011-09-08 6.07

MODERATE FLOODS Date of Flood Crest(ft) 1996-10-20 6.73 2011-03-11 7.17 2011-08-28 7.42

MAJOR FLOODS Date of Flood Crest(ft) 2010-03-15 7.5

MISSING Date of Flood Crest(ft) 1903-10-10 17.4 1968-05-29 15.7 1969-08-06 15 1970-04-03 15.2 1972-06-23 15.33 1973-02-03 15.3 1978-03-27 15.27 1983-03-19 15.37 1984-04-05 16.9 1986-04-27 15.08 1987-04-05 15.16 1989-05-17 15.25

Categorical Floods by Month Month Minor After Datum Minor Total Moderate After Datum Moderate Total Major After Datum Major Total Missing After Datum Missing Total January 3 3 0 0 0 0 0 0 February 1 1 0 0 0 0 0 1 March 8 8 1 1 1 1 0 2 April 3 3 0 0 0 0 0 4 May 2 2 0 0 0 0 0 2 June 2 2 0 0 0 0 0 1 July 0 0 0 0 0 0 0 0 August 0 0 1 1 0 0 0 1 September 1 1 0 0 0 0 0 0 October 0 0 1 1 0 0 0 1 November 0 0 0 0 0 0 0 0 December 2 2 0 0 0 0 0 0

Categorical Floods by Season Season Minor Moderate Major Missing Fall 1 1 0 1 Winter 6 0 0 1 Spring 13 1 1 8 Summer 2 1 0 2

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