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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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1841-10-18 -9999 250000 Missing *** 1903-10-10 35.9 275000 Major *** 1907-12-11 22.5 120000 Minor *** 1913-03-28 25 144000 Minor *** 1914-03-29 23.4 130000 Minor *** 1920-03-14 22.1 120000 Minor *** 1924-04-08 23.1 122000 Minor none 1924-10-01 24.2 132000 Minor none 1925-02-12 23.82 128000 Minor none 1926-11-17 22.6 118000 Minor none 1933-08-25 25 141000 Minor none 1935-07-10 23.2 125000 Minor none 1936-03-12 29.8 185000 Moderate none 1936-03-19 32.45 237000 Major none 1938-09-23 23 123000 Minor none 1940-04-01 26.47 154000 Moderate none 1942-05-24 27.5 164000 Moderate none 1942-12-31 22.88 122800 Minor none 1948-03-23 23.28 121300 Minor none 1948-12-31 24.5 131900 Minor none 1950-11-27 22.5 114700 Minor none 1951-04-01 24.03 127800 Minor none 1952-12-12 25.4 140000 Minor none 1955-08-19 38.85 340000 Major (A) 1955-10-16 23.8 133000 Minor (A) 1960-04-05 22.6 121000 Minor (A) 1973-06-30 24.36 139000 Minor (A) (F) 1973-12-22 22.55 118000 Minor (A) (F) 1977-03-14 22.16 117000 Minor (A) (F) 1983-04-17 24.17 137000 Minor (A) (F) 1984-05-30 24.46 140000 Minor (A) (F) 1986-03-16 25.16 147000 Minor (A) (F) 1996-01-20 28.72 187000 Moderate (A) (F) 2004-09-19 30.95 216000 Major (A) (F) 2005-04-04 34.07 262000 Major (A) (F) 2006-06-29 33.62 -9999 Major (A) (F) 2011-03-07 22.35 -9999 Minor none 2011-03-12 25.2 -9999 Minor none 2011-08-29 24.56 -9999 Minor none 2011-09-09 28.06 -9999 Moderate none

MARFC Codes
Code Description
(!!!) Datum changed during this year.
(1) Backwater Effect.
(2) 15.77 ft also occurred on 11/25/1950 but only counted as one flood.
(3) Estimated from currrent USGS rating table.
(4) Estimated height from the USGS.
(5) Gage height at a different site and/or datum
(6) Discharge affected by Regulation or Diversion
(7) Due to changes, prior floods were based on present flood stage. Therefore, flood data could possibly be incomplete.
(8) Gage is a staff gage and not the offical USGS gage. Therefore, some floods may be missing from our study.
(9) Discharge effected by snow-melt, ice jam or debris jam break up
(A) Discharge affected to unknown degree by regulation or diversion.
(B) Month or day of occurrence is unknown or not exact.
(C) All or part of the record affected by urbanization, mining, agricultural changes, channelization, or other factors.
(D) Crest height adjusted to current datum.
(E) Estimated discharge.
(F) Only annual maximum peak available for this year.
(O) This flood occurred at a previous flood stage that is lower than the current flood stage. This is only a historical flood.
** Crest information looks reasonable despite potential problems. This data was used in our study.
*** Crest information looks unreliable and incomplete and was not used in our flood frequency study.
**** Gauge was discontinued in 2004. 2004 and later was not used in our study.
none No code

Updated: 08:58 AM Jun 28, 2012