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West Branch Perkiomen Creek at Hillegass

Highest listed crest 6.68 ftFlood stage 5.0 ft24 crests since 1983

The West Branch Perkiomen Creek at Hillegass crested above flood stage 22 times among the 24 crests the National Weather Service lists from 1983 to 2021. The highest, 6.68 ft on August 4, 2020, was moderate flooding, 1.68 feet above flood stage.

The gauge

Highest listed crest
6.68 ft
August 4, 2020; 3,828 cubic feet per second
Flood stage
5.0 ft
Major flooding from 8.0 ft
Crests at major
0
22 above flood stage
Most recent flood crest
September 2, 2021
6.42 ft, moderate flooding
Location
Montgomery County
Near Pottstown (10.7 mi), Emmaus (11.2 mi)

Flood stages

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

Flood categories, West Branch Perkiomen Creek at Hillegass
Action stage4.02Mar 22, 2000The level at which the NWS or its partners begin to take action
Flood stage (minor)5.017Nov 30, 2020Minimal or no property damage, but possibly some public threat
Moderate flood stage6.05Sep 2, 2021Some inundation of structures and roads near the stream
Major flood stage8.00—Extensive inundation of structures and roads

Every listed crest

24 crests from 1983 to 2021. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the West Branch Perkiomen Creek at Hillegass, 1983 to 2021 45678ft Flood stage 5.0 ftMajor 8.0 ft Dec 28, 1983: 5.52 ft, minor floodingJan 19, 1996: 6.34 ft, moderate flooding; 3,270 cubic feet per secondOct 19, 1996: 5.05 ft, minor flooding; 1,570 cubic feet per secondJan 18, 1999: 4.62 ft, action stage; 1,130 cubic feet per secondSep 16, 1999: 5.51 ft, minor flooding; 2,090 cubic feet per secondMar 22, 2000: 4.90 ft, action stage; 1,410 cubic feet per secondDec 17, 2000: 5.11 ft, minor flooding; 1,630 cubic feet per secondMay 13, 2002: 5.54 ft, minor floodingFeb 6, 2004: 5.64 ft, minor flooding; 2,260 cubic feet per secondSep 18, 2004: 5.76 ft, minor floodingApr 2, 2005: 5.28 ft, minor floodingOct 8, 2005: 6.45 ft, moderate flooding; 3,440 cubic feet per secondAug 28, 2011: 5.58 ft, minor floodingSep 7, 2011: 5.04 ft, minor floodingSep 24, 2011: 5.24 ft, minor floodingSep 29, 2011: 5.31 ft, minor floodingApr 30, 2014: 5.23 ft, minor flooding; 1,766 cubic feet per secondFeb 24, 2016: 5.45 ft, minor flooding; 2,030 cubic feet per secondAug 13, 2018: 5.71 ft, minor flooding; 2,356 cubic feet per secondNov 3, 2018: 5.43 ft, minor flooding; 2,002 cubic feet per secondJul 11, 2019: 6.53 ft, moderate flooding; 3,576 cubic feet per secondAug 4, 2020: 6.68 ft, moderate flooding; 3,828 cubic feet per secondNov 30, 2020: 5.27 ft, minor flooding; 1,814 cubic feet per secondSep 2, 2021: 6.42 ft, moderate flooding; 3,396 cubic feet per second Highest, 6.68 ft, Aug 4, 2020 1990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, West Branch Perkiomen Creek at Hillegass 1980s: 1 1990s: 3 2000s: 6 2010s: 9 9 2020s: 3 1980s1990s2000s2010s2020s
  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, West Branch Perkiomen Creek at Hillegass
1Aug 4, 20206.68+1.68Moderate3,828
2Jul 11, 20196.53+1.53Moderate3,576
3Oct 8, 20056.45+1.45Moderate3,440
4Sep 2, 20216.42+1.42Moderate3,396
5Jan 19, 19966.34+1.34Moderate3,270
6Sep 18, 20045.76+0.76Minor—
7Aug 13, 20185.71+0.71Minor2,356
8Feb 6, 20045.64+0.64Minor2,260
9Aug 28, 20115.58+0.58Minor—
10May 13, 20025.54+0.54Minor—
11Dec 28, 19835.52+0.52Minor—
12Sep 16, 19995.51+0.51Minor2,090
13Feb 24, 20165.45+0.45Minor2,030
14Nov 3, 20185.43+0.43Minor2,002
15Sep 29, 20115.31+0.31Minor—
16Apr 2, 20055.28+0.28Minor—
17Nov 30, 20205.27+0.27Minor1,814
18Sep 24, 20115.24+0.24Minor—
19Apr 30, 20145.23+0.23Minor1,766
20Dec 17, 20005.11+0.11Minor1,630
21Oct 19, 19965.05+0.05Minor1,570
22Sep 7, 20115.04+0.04Minor—
23Mar 22, 20004.90−0.10Action1,410
24Jan 18, 19994.62−0.38Action1,130

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
Graterford11.024.23 ft, Sep 2, 202111
Norristown13.026.85 ft, Sep 2, 202110

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

NOAA National Water Prediction Service, gauge HLGP1, 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.