Delaware River at Riegelsville, Warren County NJ (RGLN4)
Gage Location: Warren County, New Jersey	Site Location: Bucks County, Pennsylvania
Latitude: 40.595	Longitude: -75.19	Elevation: 125.12 ft. MSL	Drainage Area: 6328 Sq. Mi.
Minor Stage: 22 ft.	Moderate Stage: 26 ft.	Major Stage: 30 ft.
First Flood: 1841-01-08	Last Flood: 2011-09-09 Crest: 28.06 ft.	Datum change: 1924-02-28	Number of Floods: 40

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Month Number of Floods After Datum Number of Floods Total Cumulative Total After Datum Cumulative Total January 1 2 1 2 February 1 1 2 3 March 7 10 9 13 April 6 6 15 19 May 2 2 17 21 June 2 2 19 23 July 1 1 20 24 August 3 3 23 27 September 3 3 26 30 October 2 3 28 33 November 2 2 30 35 December 4 5 34 40 Seasonal Totals Winter (Dec-Jan-Feb) 8 Spring (Mar-Apr-May) 18 Summer (Jun-Jul-Aug) 6 Fall (Sep-Oct-Nov) 8

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: 07:53 AM Feb 11, 2013