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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MINOR FLOODS Date of Flood Crest(ft) 1907-12-11 22.5 1913-03-28 25 1914-03-29 23.4 1920-03-14 22.1 1924-04-08 23.1 1924-10-01 24.2 1925-02-12 23.82 1926-11-17 22.6 1933-08-25 25 1935-07-10 23.2 1938-09-23 23 1942-12-31 22.88 1948-03-23 23.28 1948-12-31 24.5 1950-11-27 22.5 1951-04-01 24.03 1952-12-12 25.4 1955-10-16 23.8 1960-04-05 22.6 1973-06-30 24.36 1973-12-22 22.55 1977-03-14 22.16 1983-04-17 24.17 1984-05-30 24.46 1986-03-16 25.16 2011-03-07 22.35 2011-03-12 25.2 2011-08-29 24.56

MODERATE FLOODS Date of Flood Crest(ft) 1936-03-12 29.8 1940-04-01 26.47 1942-05-24 27.5 1996-01-20 28.72 2011-09-09 28.06

MAJOR FLOODS Date of Flood Crest(ft) 1903-10-10 35.9 1936-03-19 32.45 1955-08-19 38.85 2004-09-19 30.95 2005-04-04 34.07 2006-06-29 33.62

MISSING Date of Flood Crest(ft) 1841-01-08 -9999

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 0 0 1 1 0 0 0 1 February 1 1 0 0 0 0 0 0 March 5 8 1 1 1 1 0 0 April 4 4 1 1 1 1 0 0 May 1 1 1 1 0 0 0 0 June 1 1 0 0 1 1 0 0 July 1 1 0 0 0 0 0 0 August 2 2 0 0 1 1 0 0 September 1 1 1 1 1 1 0 0 October 2 2 0 0 0 1 0 0 November 2 2 0 0 0 0 0 0 December 4 5 0 0 0 0 0 0

Categorical Floods by Season Season Minor Moderate Major Missing Fall 5 1 2 0 Winter 6 1 0 1 Spring 13 3 2 0 Summer 4 0 2 0

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