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
2011-11-2314.1537300none
2011-12-0813.5533100Minornone
2013-01-3113.9936200Minornone
2014-05-0120.8390600Majornone



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: 08:00 PM May 28, 2014