Schuylkill River at Pottstown, Montgomery County PA (PTNP1)
Gage Location: Montgomery County, PennsylvaniaSite Location: Montgomery County, Pennsylvania
Latitude: 40.242Longitude: -75.652Elevation: 117.86 ft. MSLDrainage Area: 1147 Sq. Mi.
Minor Stage: 12.5 ft. Moderate Stage: 18 ft.Major Stage: 22 ft.
First Flood: 1902-02-28Last Flood: 2011-09-09 Crest: 18.27 ft.Datum change: 2011-08-17Number of Floods: 38

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1902-02-282153900ModerateC1
1933-08-2419.247800ModerateC1
1935-07-1014.8931000MinorC1
1936-03-1215.1331800MinorC1
1940-03-1513.4827000MinorC1
1942-05-2320.1550800ModerateC1
1948-12-3113.1825100MinorC1
1950-11-2617.942000MinorC1
1950-12-0515.131700MinorC1
1952-11-2214.1228300MinorC1
1955-08-1917.9842300MinorC1
1965-02-0813.0825000MinorC1
1969-07-2913.6425400MinorC1
1970-04-0314.5228600MinorC1
1971-02-1417.0438100MinorC1
1972-06-2329.9795900MajorC1
1973-06-2914.3528100MinorC1 G1
1973-12-2113.5622500MinorC1 G1
1976-01-2717.8841800MinorC1
1978-01-2615.4132800MinorC1 F2
1979-01-2518.2143000ModerateC1 F2
1979-02-2614.4729500MinorC1 F2
1983-04-1615.6734400MinorC1 F2
1983-12-1415.132400MinorC1 F2
1987-09-0915.3433200MinorC1 F2
1989-05-0614.1829300MinorC1 F2
1993-11-2913.6426000MinorC1 F2
1996-01-2014.8429900MinorC1 F2
1996-10-2014.427200MinorC1 F2
1999-09-1714.4227300MinorC1 F2
2003-06-2013.0423400MinorC1 F2
2004-07-2813.0223327MinorC1 F2
2004-09-1914.5927800MinorC1 F2
2005-04-0313.3524200MinorC1 F2
2005-10-0816.2833100MinorC1 F2
2006-06-2920.8450300ModerateC1 F2
2011-03-1114.1326500MinorC1 F2
2011-09-0918.2742100ModerateF2



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: 07:20 AM Nov 12, 2013