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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Date of Flood Crest(ft) Streamflow(cfs) Category Code 1975-09-27 15.36 29400 Major none 1976-01-27 9.44 14000 Minor none 1976-10-10 9.18 13400 Minor none 1977-03-05 7.15 9170 Minor none 1977-12-21 7.5 9870 Minor none 1978-01-27 9.19 13400 Minor none 1978-03-27 8.21 11340 Minor none 1979-01-22 7.12 9110 Minor none 1979-01-25 14.43 26600 Major none 1979-02-26 8.94 12900 Minor none 1983-04-16 9.45 13700 Minor none 1983-12-14 7.69 9970 Minor none 1984-05-30 7.19 8960 Minor none 1986-03-15 7.3 9180 Minor (1) 1987-09-14 7.85 10300 Minor none 1988-05-20 8.02 10600 Minor none 1989-05-07 7.35 9280 Minor none 1989-05-17 8.33 11300 Minor none 1993-11-29 10.33 16500 Moderate none 1993-12-06 7.62 10200 Minor none 1996-01-20 14.3 26000 Major none 1996-01-28 9.11 13500 Minor none 1996-10-20 8.08 11200 Minor none 1996-12-14 7.36 9640 Minor none 2000-03-22 8 11000 Minor none 2000-12-18 7.32 9560 Minor none 2003-12-12 7.51 9970 Minor none 2004-09-19 14.27 26000 Major none 2004-09-29 7.01 8880 Minor none 2005-01-15 7.01 8880 Minor none 2005-03-29 7.51 9970 Minor none 2005-04-04 8.01 11100 Minor none 2006-06-29 16.12 -9999 Major none 2006-10-29 7.05 8970 Minor none 2006-11-17 7.19 9280 Minor none 2007-03-03 8.37 11900 Minor none 2008-03-06 11.06 17400 Moderate none 2008-12-12 7.1 8800 Minor none 2010-10-01 7.63 9890 minor none 2011-03-07 7.44 9490 Minor none 2011-03-12 10.97 17200 Moderate none 2011-04-17 8.34 11400 Minor none 2011-09-08 26.8 72500 Major none 2011-09-28 7.4 9390 Minor none 2011-11-23 7.16 8920 Minor none

MARFC Codes
Code Description
(!!!) Datum changed during this year.
(1) Backwater Effect.
(2) 15.77 ft also occurred on 11/25/1950 but only counted as one flood.
(3) Estimated from currrent USGS rating table.
(4) Estimated height from the USGS.
(5) Gage height at a different site and/or datum
(6) Discharge affected by Regulation or Diversion
(7) Due to changes, prior floods were based on present flood stage. Therefore, flood data could possibly be incomplete.
(8) Gage is a staff gage and not the offical USGS gage. Therefore, some floods may be missing from our study.
(9) Discharge effected by snow-melt, ice jam or debris jam break up
(A) Discharge affected to unknown degree by regulation or diversion.
(B) Month or day of occurrence is unknown or not exact.
(C) All or part of the record affected by urbanization, mining, agricultural changes, channelization, or other factors.
(D) Crest height adjusted to current datum.
(E) Estimated discharge.
(F) Only annual maximum peak available for this year.
(O) This flood occurred at a previous flood stage that is lower than the current flood stage. This is only a historical flood.
** Crest information looks reasonable despite potential problems. This data was used in our study.
*** Crest information looks unreliable and incomplete and was not used in our flood frequency study.
**** Gauge was discontinued in 2004. 2004 and later was not used in our study.
none No code

Updated: 08:58 AM Jun 28, 2012