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 during this period may be incomplete and therefore was not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information during this period 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: 07:31 AM Dec 19, 2014