Major Flood
30 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
21 ft
Minor Flood
20 ft
Action Stage
10 ft
What Floods at Each Level
45 ft
Flood waters begin to reach the Market Street Bridge in Williamsport.
41 ft
FEMA 0.2% Annual Chance Flood Level (500-year flood).
34.7 ft
Flood of record from Hurricane Agnes in 1972. FEMA 1% Annual Chance Flood Level (100-year flood).
34 ft
Widespread flooding occurs in areas not protected by the levee system.
33 ft
Flood waters begin to reach the Arch Street Bridge in Williamsport.
32 ft
Widespread flooding occurs in areas not protected by the levee system. The protective works for Route 220 are closed at this level. Flood waters begin to reach the Maynard Street Bridge in Williamsport.
31.5 ft
FEMA 2% Annual Chance Flood Level (50-year flood).
30 ft
Many homes and businesses outside the levee system are affected by high water.
23 ft
Low lying areas on both banks are inundated. FEMA 10% Annual Chance Flood Level (10-year flood).
21 ft
A number of residences and roads in the area outside the levee system are affected.
20 ft
High water affects a few homes and some roadways in areas not protected by the levee system. The camping area west of Williamsport is significantly affected.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jun 22, 1972 | 34.75 ft | 279,000 cfs |
| Mar 17, 1936 | 33.57 ft | 264,000 cfs |
| May 31, 1889 | 32.4 ft | 252,000 cfs |
About This Gauge
USGS Site
NWS LID
WILP1
River
West Branch Susquehanna River
County
Lycoming, PA
Coordinates
41.2361°N, 76.9969°W
Get Flood Alerts for West Branch Susquehanna River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of West Branch Susquehanna River at Williamsport?
The West Branch Susquehanna River at Williamsport gauge is maintained by USGS (site 01551500) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for West Branch Susquehanna River at Williamsport?
The NWS-defined flood stage for West Branch Susquehanna River at Williamsport is 20 feet. Action stage begins at 10 feet. Moderate flooding starts at 21 feet, and major flooding at 30 feet.
How do I get alerts when West Branch Susquehanna River rises?
Download StormCast free on Google Play, go to River Gauges, and add West Branch Susquehanna River at Williamsport to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the West Branch Susquehanna River at Williamsport gauge located?
The gauge is located in Lycoming County, Pennsylvania at coordinates 41.2361°N, 76.9969°W. USGS site number: 01551500. Data is provided by the U.S. Geological Survey and the National Weather Service.
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On This River
Upstream: West Branch Susquehanna River at Jersey Shore
Downstream: West Branch Susquehanna River near Muncy
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- Gauge reading may be affected by ice. Forecast flows are unadjusted for ice.