Lehigh River at Bethlehem, Lehigh County PA (BETP1)
Gage Location: Lehigh County, PennsylvaniaSite Location: Lehigh/Northampton County, Pennsylvania
Latitude: 40.615Longitude: -75.379Elevation: 210.9 ft. MSLDrainage Area: 1279 Sq. Mi.
Minor Stage: 16 ft. Moderate Stage: 20 ft.Major Stage: 22 ft.
First Flood: 1902-02-28Last Flood: 2011-03-11 Crest: 17.17 ft.Datum change: 1963-10-01Number of Floods: 15

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1902-02-2824.988000MajorC1
1924-10-0116.243500MinorC1
1926-11-1716.744000MinorC1
1933-08-2418.764800MinorC1
1935-07-1018.5363700MinorC1
1936-03-1217.0455700MinorC1
1942-05-2325.992000MajorC1
1955-08-1923.3891300MajorC1
1972-06-2320.0257900ModerateF2
1979-01-2517.1251700MinorF2
1996-01-2016.6844900MinorF2
2004-09-1819.756700MinorF2
2005-04-0316.0642600MinorF2
2006-06-2817.7449000MinorF2
2011-03-1117.1746800MinorF2



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