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: 2013-01-31 Crest: 13.99 ft.Datum change: 2011-08-17Number of Floods: 20

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1991-10-1918-9999MinorC1 G1
1993-12-0517.6-9999MinorC1 G1
1996-01-2019-9999ModerateC1 G1
1999-09-1722-9999MajorC1 G1

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