Swatara Creek at Middletown, Dauphin County PA (Old Site - MIDP1)
Gage Location: Dauphin County, Pennsylvania Site Location: Dauphin County, Pennsylvania
Latitude: 40.2Longitude: -76.717Elevation: 284 ft. MSL Drainage Area: 569 Sq. Mi.
Minor Stage: 11 ft. Moderate Stage: 14 ft.Major Stage: 16 ft.
First Flood: 1972-06-23Last Flood: 2011-09-09 Crest: 23.23 ft.Datum change: 1975-09-01Number of Floods: 25

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Height Above Flood Stage for Entire Period of Record
Height Above FSTotal OccurencePercent of Crest OccurrenceCumulative Total Flood OccurrencePercent of Floods above Listed Value
10 ft to 11 ft14.010 ft or above 25100.0
11 ft to 12 ft936.011 ft or above 2496.0
12 ft to 13 ft312.012 ft or above 1560.0
13 ft to 14 ft312.013 ft or above 1248.0
14 ft to 15 ft28.014 ft or above 936.0
15 ft to 16 ft28.015 ft or above 728.0
16 ft to 17 ft00.016 ft or above 520.0
17 ft to 18 ft00.017 ft or above 520.0
18 ft to 19 ft00.018 ft or above 520.0
19 ft to 20 ft28.019 ft or above 520.0
20 ft to 21 ft14.020 ft or above 312.0
21 ft to 22 ft00.021 ft or above 28.0
22 ft to 23 ft00.022 ft or above 28.0
23 ft to 24 ft14.023 ft or above 28.0
24 ft to 25 ft00.024 ft or above 14.0
25 ft to 26 ft00.025 ft or above 14.0
26 ft to 27 ft00.026 ft or above 14.0
27 ft to 28 ft00.027 ft or above 14.0
28 ft to 29 ft14.028 ft or above 14.0
Height Above Flood Stage After Datum Change
Height Above FSTotal OccurencePercent of Crest OccurrenceCumulative Total Flood OccurrencePercent of Floods above Listed Value
11 ft to 12 ft937.511 ft or above 24100.0
12 ft to 13 ft312.512 ft or above 1562.5
13 ft to 14 ft312.513 ft or above 1250.0
14 ft to 15 ft28.314 ft or above 937.5
15 ft to 16 ft28.315 ft or above 729.2
16 ft to 17 ft00.016 ft or above 520.8
17 ft to 18 ft00.017 ft or above 520.8
18 ft to 19 ft00.018 ft or above 520.8
19 ft to 20 ft28.319 ft or above 520.8
20 ft to 21 ft14.220 ft or above 312.5
21 ft to 22 ft00.021 ft or above 28.3
22 ft to 23 ft00.022 ft or above 28.3
23 ft to 24 ft14.223 ft or above 28.3
24 ft to 25 ft00.024 ft or above 14.2
25 ft to 26 ft00.025 ft or above 14.2
26 ft to 27 ft00.026 ft or above 14.2
27 ft to 28 ft00.027 ft or above 14.2
28 ft to 29 ft00.028 ft or above 14.2




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