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

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Year Before Datum Change Number of Floods 1942 1 1943 0 1944 0 1945 0

Year After Datum Change Number of Floods 1946 0 1947 1 1948 1 1949 0 1950 2 1951 0 1952 4 1953 0 1954 0 1955 2 1956 0 1957 1 1958 0 1959 0 1960 0 1961 0 1962 0 1963 0 1964 0 1965 1 1966 0 1967 0 1968 0 1969 1 1970 2 1971 0 1972 1 1973 2 1974 0 1975 0 1976 1 1977 0 1978 1 1979 2 1980 0 1981 1 1982 0 1983 2 1984 0 1985 1 1986 1 1987 1 1988 0 1989 1 1990 1 1991 0 1992 0 1993 3 1994 0 1995 0 1996 2 1997 0 1998 0 1999 0 2000 0 2001 0 2002 0 2003 2 2004 1 2005 1 2006 2 2007 0 2008 1 2009 0 2010 2 2011 2 2012 0 2013 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: 08:09 AM Feb 08, 2013