Delaware River at Trenton, Mercer County NJ (TREN4)
Gage Location: Mercer County, New Jersey	Site Location: Mercer County, New Jersey
Latitude: 40.222	Longitude: -74.778	Elevation: 0 ft. MSL	Drainage Area: 6780 Sq. Mi.
Minor Stage: 20 ft.	Moderate Stage: 23 ft.	Major Stage: 25 ft.
First Flood: 1687-05-29	Last Flood: 2011-09-08 Crest: 23.11 ft.	Datum change: 1928-10-03	Number of Floods: 27

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Month Number of Floods After Datum Number of Floods Total Cumulative Total After Datum Cumulative Total January 2 2 2 2 February 0 2 2 4 March 5 9 7 13 April 2 2 9 15 May 2 3 11 18 June 1 1 12 19 July 0 0 12 19 August 3 3 15 22 September 2 3 17 25 October 0 1 17 26 November 0 0 17 26 December 1 1 18 27 Seasonal Totals Winter (Dec-Jan-Feb) 5 Spring (Mar-Apr-May) 14 Summer (Jun-Jul-Aug) 4 Fall (Sep-Oct-Nov) 4

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