Passaic River near Chatham, Morris County NJ (CAMN4)
Gage Location: Morris County, New Jersey	Site Location: Morris County, New Jersey
Latitude: 40.726	Longitude: -74.39	Elevation: 193.51 ft. MSL	Drainage Area: 100 Sq. Mi.
Minor Stage: 6 ft.	Moderate Stage: 7.2 ft.	Major Stage: 8.2 ft.
First Flood: 1903-10-11	Last Flood: 2011-09-09 Crest: 6.25 ft.	Datum change: 1937-10-01	Number of Floods: 81

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Height Above Flood Stage for Entire Period of Record Height Above FS Total Occurence Percent of Crest Occurrence Cumulative Total Flood Occurrence Percent of Floods above Listed Value 6 ft to 7 ft 63 77.8 6 ft or above 81 100.0 7 ft to 8 ft 13 16.0 7 ft or above 18 22.2 8 ft to 9 ft 4 4.9 8 ft or above 5 6.2 9 ft to 10 ft 1 1.2 9 ft or above 1 1.2

Height Above Flood Stage After Datum Change Height Above FS Total Occurence Percent of Crest Occurrence Cumulative Total Flood Occurrence Percent of Floods above Listed Value 6 ft to 7 ft 63 81.8 6 ft or above 77 100.0 7 ft to 8 ft 11 14.3 7 ft or above 14 18.2 8 ft to 9 ft 2 2.6 8 ft or above 3 3.9 9 ft to 10 ft 1 1.3 9 ft or above 1 1.3

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