Delaware River at Washington Crossing, Mercer County NJ (WASN4)
Gage Location: Mercer County, New Jersey	Site Location: Bucks County, Pennsylvania
Latitude: 40.294	Longitude: -74.869	Elevation: 26.14 ft. MSL	Drainage Area: 6735 Sq. Mi.
Minor Stage: 16 ft.	Moderate Stage: 19 ft.	Major Stage: 22 ft.
First Flood: 1903-10-11	Last Flood: 2011-09-08 Crest: 20.4 ft.	Datum change: 2011-08-17	Number of Floods: 10

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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1903-10-11 25.5 -9999 Major C1 1936-03-13 20.21 -9999 Minor C1 1936-03-19 21.3 -9999 Minor C1 1955-08-20 27.77 -9999 Major C1 2004-09-19 22 -9999 Moderate C1 2004-09-28 20.2 -9999 Minor C1 2005-04-04 23.1 -9999 Moderate C1 2006-06-29 22.54 -9999 Moderate C1 2011-08-29 16.06 -9999 Minor none 2011-09-08 20.4 -9999 Moderate none

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: 01:02 PM Jun 12, 2013