West Branch Susquehanna River at Williamsport, PA

The last 7 days and the forecast

NWS forecast issued Mon, Oct 12, 2:51 PM. Forecasts change as rain falls and as upstream water arrives.

Flood stages

What floods at each level

From the National Weather Service, highest first.

• 45 ftFlood waters begin to reach the Market Street Bridge in Williamsport.
• 41 ftFEMA 0.2% Annual Chance Flood Level (500-year flood).
• 34.7 ftFlood of record from Hurricane Agnes in 1972. FEMA 1% Annual Chance Flood Level (100-year flood).
• 34 ftWidespread flooding occurs in areas not protected by the levee system.
• 33 ftFlood waters begin to reach the Arch Street Bridge in Williamsport.
• 32 ftWidespread 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 ftFEMA 2% Annual Chance Flood Level (50-year flood).
• 30 ftMany homes and businesses outside the levee system are affected by high water.
• 23 ftLow lying areas on both banks are inundated. FEMA 10% Annual Chance Flood Level (10-year flood).
• 21 ftA number of residences and roads in the area outside the levee system are affected.
• 20 ftHigh 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.

Highest crests on record

1. 34.75 ft — June 23, 1972
2. 33.57 ft — March 18, 1936
3. 32.4 ft — June 1, 1889
4. 31 ft — May 21, 1884
5. 29.6 ft — May 28, 1946

Recent crests: 21.08 ft (September 11, 2018) · 20.27 ft (April 28, 2011) · 23.25 ft (December 2, 2010) · 27.82 ft (September 18, 2004) · 26.70999908447266 ft (January 20, 1996)

Up and down the river, and nearby

• UpstreamWest Branch Susquehanna River at Jersey Shore, PA
• Lycoming Creek near Williamsport, PA
• Loyalsock Creek at Loyalsockville, PA
• West Branch Susquehanna River at Allenwood, PA
• Lycoming Creek near Trout Run (Camp Susque), PA
• Muncy Creek at Muncy Creek, PA
• West Branch Susquehanna River at West Milton, PA
• Pine Creek near Waterville, PA