Lehigh River at Walnutport, Northampton County PA (WNTP1)
Gage Location: Northampton County, PennsylvaniaSite Location: Northampton County, Pennsylvania
Latitude: 40.757Longitude: -75.603Elevation: 350.27 ft. MSLDrainage Area: 889 Sq. Mi.
Minor Stage: 8 ft. Moderate Stage: 12 ft.Major Stage: 16 ft.
First Flood: 1942-05-23Last Flood: 2011-09-07 Crest: 8.01 ft.Datum change: 1946-10-01Number of Floods: 47

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1942-05-2320.6-9999MajorC1
1947-07-088.3523000Minornone
1948-12-308.1921900Minornone
1950-11-2511.2638200Minornone
1950-12-0412.6646000Moderatenone
1952-03-119.4227300Minornone
1952-07-109.1526200Minornone
1952-11-2210.9736100Minornone
1952-12-1110.231700Minornone
1955-08-1917.6877800Majornone
1955-10-169.2125600Minornone
1957-12-2111.3537600Minornone
1965-02-088.0811800MinorF2
1969-08-029.53-9999MinorF2
1970-02-039.36-9999MinorF2
1970-04-028.8923800MinorF2
1972-06-2311.6539000MinorF2
1973-06-299.2425700MinorF2
1973-12-218.421100MinorF2
1976-01-278.722800MinorF2
1978-01-098.7723100MinorF2
1979-01-259.7428500MinorF2
1979-02-2410.8834700MinorF2
1981-02-118.2320200MinorF2
1983-04-1611.2837400MinorF2
1983-12-149.1625400MinorF2
1985-09-279.5926100MinorF2
1986-03-158.6921800MinorF2
1987-09-1310.5631200MinorF2
1989-05-069.8429000MinorF2
1990-05-178.3921500MinorF2
1993-04-028.0318100MinorF2
1993-04-119.4925000MinorF2
1993-11-289.3924500MinorF2
1996-01-1912.3240100ModerateF2
1996-12-029.4724200MinorF2
2003-06-218.0216840MinorF2
2003-09-238.419800MinorF2
2004-09-1812.340000ModerateF2
2005-04-0310.4930000MinorF2
2006-06-268.3219400MinorF2
2006-06-2812.4941100ModerateF2
2008-03-058.9922500MinorF2
2010-10-019.112300minorF2
2010-12-018.2619100MinorF2
2011-03-1112.7242500ModerateF2
2011-09-078.0118000MinorF2



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: 08:00 PM May 28, 2014