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Loyalsock Creek at Loyalsockville

Highest listed crest 19.78 ftFlood stage 12.0 ft17 crests since 1926

The Loyalsock Creek at Loyalsockville crested at major flood stage 5 times among the 17 crests the National Weather Service lists from 1926 to 2020. The highest, 19.78 ft on September 8, 2011, was major flooding, 7.78 feet above flood stage.

The gauge

Highest listed crest
19.78 ft
September 8, 2011; 69,140 cubic feet per second
Flood stage
12.0 ft
Major flooding from 14.0 ft
Crests at major
5
44th of 170 gauges in Pennsylvania
Most recent flood crest
December 25, 2020
12.45 ft, minor flooding
Location
Lycoming County
Near Williamsport (8.7 mi)

Flood stages

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

Flood categories, Loyalsock Creek at Loyalsockville
Action stage9.01Aug 18, 1994The level at which the NWS or its partners begin to take action
Flood stage (minor)12.011Dec 25, 2020Minimal or no property damage, but possibly some public threat
Moderate flood stage13.00—Some inundation of structures and roads near the stream
Major flood stage14.05Sep 8, 2011Extensive inundation of structures and roads

Every listed crest

17 crests from 1926 to 2020. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Loyalsock Creek at Loyalsockville, 1926 to 2020 101214161820ft Flood stage 12.0 ftMajor 14.0 ft Nov 16, 1926: 12.20 ft, minor flooding; 51,200 cubic feet per secondAug 24, 1933: 12.20 ft, minor flooding; 50,000 cubic feet per secondMay 28, 1946: 12.20 ft, minor flooding; 51,200 cubic feet per secondNov 26, 1950: 12.32 ft, minor flooding; 51,200 cubic feet per secondJun 23, 1972: 14.74 ft, major flooding; 47,900 cubic feet per secondSep 26, 1975: 14.50 ft, major flooding; 46,000 cubic feet per secondFeb 1, 1982: 12.45 ft, minor floodingDec 14, 1983: 12.18 ft, minor flooding; 49,800 cubic feet per secondAug 29, 1988: 12.41 ft, minor flooding; 52,000 cubic feet per secondAug 18, 1994: 11.28 ft, action stage; 36,600 cubic feet per secondJan 19, 1996: 17.93 ft, major flooding; 55,800 cubic feet per secondJan 27, 1996: 12.18 ft, minor flooding; 48,600 cubic feet per secondSep 18, 2004: 15.24 ft, major flooding; 40,400 cubic feet per secondMar 11, 2011: 12.42 ft, minor flooding; 30,480 cubic feet per secondSep 8, 2011: 19.78 ft, major flooding; 69,140 cubic feet per secondOct 21, 2016: 12.03 ft, minor flooding; 28,820 cubic feet per secondDec 25, 2020: 12.45 ft, minor flooding; 29,128 cubic feet per second Highest, 19.78 ft, Sep 8, 2011 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Loyalsock Creek at Loyalsockville 1920s: 1 1930s: 1 1940s: 1 1950s: 1 1960s: 0 1970s: 2 1980s: 3 3 1990s: 2 2000s: 1 2010s: 3 2020s: 1 1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  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, Loyalsock Creek at Loyalsockville
1Sep 8, 201119.78+7.78Major69,140
2Jan 19, 199617.93+5.93Major55,800
3Sep 18, 200415.24+3.24Major40,400
4Jun 23, 197214.74+2.74Major47,900
5Sep 26, 197514.50+2.50Major46,000
6Feb 1, 198212.45+0.45Minor—
7Dec 25, 202012.45+0.45Minor29,128
8Mar 11, 201112.42+0.42Minor30,480
9Aug 29, 198812.41+0.41Minor52,000
10Nov 26, 195012.32+0.32Minor51,200
11Nov 16, 192612.20+0.20Minor51,200
12Aug 24, 193312.20+0.20Minor50,000
13May 28, 194612.20+0.20Minor51,200
14Dec 14, 198312.18+0.18Minor49,800
15Jan 27, 199612.18+0.18Minor48,600
16Oct 21, 201612.03+0.03Minor28,820
17Aug 18, 199411.28−0.72Action36,600

Other gauges in Lycoming County

Flood gauges in Lycoming County
Muncy Creek15.023.06 ft, Sep 7, 20110
Cedar Run12.016.00 ft, Jun 23, 19721
Jersey Shore26.038.20 ft, Jun 23, 19727
Williamsport20.034.75 ft, Jun 23, 19724
Muncy20.037.45 ft, Jun 23, 19728

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

NOAA National Water Prediction Service, gauge LOYP1, 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.