Search
Menu

Explore

Hazards

Analysis

Rankings

Reference

Perkiomen Creek at Graterford

Highest listed crest 24.23 ftFlood stage 11.0 ft42 crests since 1933

The Perkiomen Creek at Graterford crested at major flood stage 11 times among the 42 crests the National Weather Service lists from 1933 to 2024. The highest, 24.23 ft on September 2, 2021, was major flooding, 13.23 feet above flood stage. 1 other gauge on the Perkiomen Creek crested above flood stage within a week of it.

The gauge

Highest listed crest
24.23 ft
September 2, 2021; 45,274 cubic feet per second
Flood stage
11.0 ft
Major flooding from 16.0 ft
Crests at major
11
11th of 170 gauges in Pennsylvania
Most recent flood crest
January 10, 2024
13.57 ft, moderate flooding
Location
Montgomery County
Near Phoenixville (7.5 mi), Lansdale (9.0 mi), Norristown (9.5 mi)

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Perkiomen Creek at Graterford
Action stage8.04Mar 11, 2011The level at which the NWS or its partners begin to take action
Flood stage (minor)11.010Dec 25, 2020Minimal or no property damage, but possibly some public threat
Moderate flood stage13.017Jan 10, 2024Some inundation of structures and roads near the stream
Major flood stage16.011Sep 2, 2021Extensive inundation of structures and roads

Every listed crest

42 crests from 1933 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Perkiomen Creek at Graterford, 1933 to 2024 510152025ft Flood stage 11.0 ftMajor 16.0 ft Aug 23, 1933: 16.65 ft, major flooding; 34,600 cubic feet per secondJul 9, 1935: 18.26 ft, major flooding; 39,900 cubic feet per secondJun 2, 1946: 16.20 ft, major flooding; 31,700 cubic feet per secondJun 22, 1972: 17.08 ft, major flooding; 35,800 cubic feet per secondJan 24, 1979: 14.80 ft, moderate floodingSep 22, 1979: 12.53 ft, minor floodingJul 7, 1984: 15.06 ft, moderate floodingSep 27, 1985: 13.18 ft, moderate floodingDec 5, 1993: 14.68 ft, moderate floodingDec 28, 1993: 11.46 ft, minor floodingMar 9, 1995: 13.30 ft, moderate floodingJan 19, 1996: 16.45 ft, major flooding; 32,500 cubic feet per secondOct 19, 1996: 15.67 ft, moderate flooding; 29,600 cubic feet per secondMar 22, 1999: 9.73 ft, action stageSep 16, 1999: 16.59 ft, major flooding; 33,700 cubic feet per secondMar 22, 2000: 11.89 ft, minor flooding; 17,300 cubic feet per secondJun 4, 2003: 10.57 ft, action stageJun 21, 2003: 13.78 ft, moderate flooding; 23,100 cubic feet per secondSep 15, 2003: 12.43 ft, minor floodingOct 28, 2003: 12.08 ft, minor floodingJul 28, 2004: 12.49 ft, minor flooding; 19,000 cubic feet per secondSep 18, 2004: 14.80 ft, moderate flooding; 26,500 cubic feet per secondApr 3, 2005: 14.18 ft, moderate flooding; 24,400 cubic feet per secondOct 8, 2005: 14.92 ft, moderate flooding; 26,900 cubic feet per secondJun 28, 2006: 13.68 ft, moderate flooding; 22,700 cubic feet per secondApr 15, 2007: 12.43 ft, minor flooding; 18,900 cubic feet per secondMar 14, 2010: 10.65 ft, action stageOct 1, 2010: 14.86 ft, moderate floodingMar 11, 2011: 10.43 ft, action stage; 14,490 cubic feet per secondAug 28, 2011: 18.20 ft, major flooding; 39,700 cubic feet per secondSep 7, 2011: 13.93 ft, moderate flooding; 24,620 cubic feet per secondMay 1, 2014: 16.20 ft, major flooding; 30,200 cubic feet per secondAug 13, 2018: 11.39 ft, minor flooding; 15,439 cubic feet per secondNov 3, 2018: 13.33 ft, moderate flooding; 20,190 cubic feet per secondJul 12, 2019: 16.03 ft, major flooding; 29,473 cubic feet per secondAug 5, 2020: 19.32 ft, major flooding; 44,613 cubic feet per secondDec 1, 2020: 12.46 ft, minor flooding; 17,929 cubic feet per secondDec 25, 2020: 12.93 ft, minor flooding; 19,104 cubic feet per secondSep 2, 2021: 24.23 ft, major flooding; 45,274 cubic feet per secondDec 18, 2023: 13.97 ft, moderate flooding; 21,983 cubic feet per secondDec 28, 2023: 13.87 ft, moderate flooding; 21,698 cubic feet per secondJan 10, 2024: 13.57 ft, moderate flooding; 20,854 cubic feet per second Highest, 24.23 ft, Sep 2, 2021 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Perkiomen Creek at Graterford 1930s: 2 1940s: 1 1950s: 0 1960s: 0 1970s: 3 1980s: 2 1990s: 6 2000s: 10 10 2010s: 7 2020s: 7 1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

Highest listed crests, Perkiomen Creek at Graterford
1Sep 2, 202124.23+13.23Major45,274
2Aug 5, 202019.32+8.32Major44,613
3Jul 9, 193518.26+7.26Major39,900
4Aug 28, 201118.20+7.20Major39,700
5Jun 22, 197217.08+6.08Major35,800
6Aug 23, 193316.65+5.65Major34,600
7Sep 16, 199916.59+5.59Major33,700
8Jan 19, 199616.45+5.45Major32,500
9Jun 2, 194616.20+5.20Major31,700
10May 1, 201416.20+5.20Major30,200
11Jul 12, 201916.03+5.03Major29,473
12Oct 19, 199615.67+4.67Moderate29,600
13Jul 7, 198415.06+4.06Moderate—
14Oct 8, 200514.92+3.92Moderate26,900
15Oct 1, 201014.86+3.86Moderate—
16Jan 24, 197914.80+3.80Moderate—
17Sep 18, 200414.80+3.80Moderate26,500
18Dec 5, 199314.68+3.68Moderate—
19Apr 3, 200514.18+3.18Moderate24,400
20Dec 18, 202313.97+2.97Moderate21,983
21Sep 7, 201113.93+2.93Moderate24,620
22Dec 28, 202313.87+2.87Moderate21,698
23Jun 21, 200313.78+2.78Moderate23,100
24Jun 28, 200613.68+2.68Moderate22,700
25Jan 10, 202413.57+2.57Moderate20,854
26Nov 3, 201813.33+2.33Moderate20,190
27Mar 9, 199513.30+2.30Moderate—
28Sep 27, 198513.18+2.18Moderate—
29Dec 25, 202012.93+1.93Minor19,104
30Sep 22, 197912.53+1.53Minor—
31Jul 28, 200412.49+1.49Minor19,000
32Dec 1, 202012.46+1.46Minor17,929
33Sep 15, 200312.43+1.43Minor—
34Apr 15, 200712.43+1.43Minor18,900
35Oct 28, 200312.08+1.08Minor—
36Mar 22, 200011.89+0.89Minor17,300
37Dec 28, 199311.46+0.46Minor—
38Aug 13, 201811.39+0.39Minor15,439
39Mar 14, 201010.65−0.35Action—
40Jun 4, 200310.57−0.43Action—
41Mar 11, 201110.43−0.57Action14,490
42Mar 22, 19999.73−1.27Action—

The worst floods along the Perkiomen Creek

For this gauge's highest crests, the other gauges on the Perkiomen Creek that crested above flood stage within a week.

September 2, 2021: 24.23 ft here, major flooding

August 5, 2020: 19.32 ft here, major flooding

August 28, 2011: 18.20 ft here, major flooding

Gauges on the Perkiomen Creek

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Perkiomen Creek
East GreenvillePA5.09.66 ft, Aug 4, 20202
Graterford this gaugePA11.024.23 ft, Sep 2, 202111

Other gauges in Montgomery County

Flood gauges in Montgomery County
Schwenksville8.016.89 ft, Sep 2, 20217
East Greenville5.09.66 ft, Aug 4, 20202
Norristown13.026.85 ft, Sep 2, 202110
Hillegass5.06.68 ft, Aug 4, 20200

Montgomery County: every hazard · River floods across the country · Pennsylvania

NOAA National Water Prediction Service, gauge GRAP1, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.