Swatara Creek near Hershey, Dauphin County PA (HERP1)
Gage Location: Dauphin County, Pennsylvania	Site Location: Dauphin County, Pennsylvania
Latitude: 40.298	Longitude: -76.668	Elevation: 325.94 ft. MSL	Drainage Area: 483 Sq. Mi.
Minor Stage: 7 ft.	Moderate Stage: 10 ft.	Major Stage: 14 ft.
First Flood: 1975-09-27	Last Flood: 2011-11-23 Crest: 7.16 ft.	Datum change: 1975-10-01	Number of Floods: 45

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Year Before Datum Change Number of Floods

Year After Datum Change Number of Floods 1975 1 1976 2 1977 2 1978 2 1979 3 1980 0 1981 0 1982 0 1983 2 1984 1 1985 0 1986 1 1987 1 1988 1 1989 2 1990 0 1991 0 1992 0 1993 2 1994 0 1995 0 1996 4 1997 0 1998 0 1999 0 2000 2 2001 0 2002 0 2003 1 2004 2 2005 3 2006 3 2007 1 2008 2 2009 0 2010 1 2011 6 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