Schuylkill River at Norristown, Montgomery County PA (NRSP1)
Gage Location: Montgomery County, PennsylvaniaSite Location: Montgomery County, Pennsylvania
Latitude: 40.111Longitude: -75.347Elevation: 51 ft. MSLDrainage Area: 1760 Sq. Mi.
Minor Stage: 13 ft. Moderate Stage: 17 ft.Major Stage: 19 ft.
First Flood: 1933-08-24Last Flood: 2014-05-01 Crest: 20.83 ft.Datum change: 2011-08-17Number of Floods: 21

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1933-08-2421-9999ModerateC1
1971-09-1319.3-9999ModerateC1
1972-06-2325.1-9999MajorC1
1991-10-1918-9999MinorC1 G1
1993-12-0517.6-9999MinorC1 G1
1996-01-2019-9999ModerateC1 G1
1999-09-1722-9999MajorC1 G1
2003-06-2116.2856100MinorC1
2004-09-181654300MinorC1
2005-04-0316.0454600MinorC1
2005-10-0917.9268000MinorC1
2006-06-2819.1378400ModerateC1
2007-04-1515.1147800MinorC1
2010-10-0118.3172100minorC1
2011-08-2819.7681400Majornone
2011-09-0716.0655000Minornone
2011-09-2413.2333200Minornone
2011-11-2314.1537300Minornone
2011-12-0813.5533100Minornone
2013-01-3113.9936200Minornone
2014-05-0120.8390600Majornone



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