« Back to Black Forest Trail Rivers

West Branch Susquehanna River at Williamsport

Critical Stages
10' - Action
20' - Flood
21' - Moderate
30' - Major

Latest Observation

Updated: 8:15 AM EST 12/6/25

Status: No Flooding

Stage: 1.16 ft

Flow: 2.53 kcfs

Forecast

TimeStage (ft)Flow (kcfs)
1 PM 12/6 1 2.28
7 PM 12/6 1 2.28
1 AM 12/7 1 2.28
7 AM 12/7 1 2.28
1 PM 12/7 1 2.28
7 PM 12/7 1 2.28
1 AM 12/8 1 2.28
7 AM 12/8 1 2.28
TimeStage (ft)Flow (kcfs)
8:15 AM 12/6 1.16 2.53
8:00 AM 12/6 1.17 2.54
7:45 AM 12/6 1.17 2.54
7:30 AM 12/6 1.17 2.54
7:15 AM 12/6 1.18 2.56
7:00 AM 12/6 1.19 2.57
6:45 AM 12/6 1.19 2.57
6:30 AM 12/6 1.2 2.59
6:15 AM 12/6 1.2 2.59
6:00 AM 12/6 1.21 2.61
5:45 AM 12/6 1.21 2.61
5:30 AM 12/6 1.22 2.62
5:15 AM 12/6 1.22 2.62
5:00 AM 12/6 1.23 2.64
4:45 AM 12/6 1.23 2.64
4:30 AM 12/6 1.24 2.65
4:15 AM 12/6 1.24 2.65
4:00 AM 12/6 1.25 2.67
3:45 AM 12/6 1.26 2.69
3:30 AM 12/6 1.26 2.69
3:15 AM 12/6 1.27 2.7
3:00 AM 12/6 1.27 2.7
2:45 AM 12/6 1.27 2.7
2:30 AM 12/6 1.28 2.72
2:15 AM 12/6 1.28 2.72
2:00 AM 12/6 1.28 2.72
1:45 AM 12/6 1.29 2.74
1:30 AM 12/6 1.29 2.74
1:15 AM 12/6 1.29 2.74
1:00 AM 12/6 1.29 2.74
Hydrograph for West Branch Susquehanna River at Williamsport
45' - Flood waters begin to reach the Market Street Bridge in Williamsport.
41' - FEMA 0.2 0X0P+0nnual Chance Flood Level (500-year flood).
34.7' - Flood of record from Hurricane Agnes in 1972. FEMA 1 0X0P+0nnual Chance Flood Level (100-year flood).
34' - Widespread flooding occurs in areas not protected by the levee system.
33' - Flood waters begin to reach the Arch Street Bridge in Williamsport.
32' - 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' - FEMA 2 0X0P+0nnual Chance Flood Level (50-year flood).
30' - Many homes and businesses outside the levee system are affected by high water.
23' - Low lying areas on both banks are inundated. FEMA 10 0X0P+0nnual Chance Flood Level (10-year flood).
21' - A number of residences and roads in the area outside the levee system are affected.
20' - 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.
DateStage (ft)
Jun 23, 1972 34.75
Mar 18, 1936 33.57
Jun 1, 1889 32.4
May 21, 1884 31
May 28, 1946 29.6
Nov 26, 1950 28.1
Sep 18, 2004 27.82
Mar 17, 1865 27.5
Mar 11, 1964 27.25
Jan 20, 1996 26.709999084473
Feb 15, 1984 25.6
Sep 26, 1975 24.7
Mar 12, 1936 23.7
Dec 2, 2010 23.25
Jun 23, 1959 23
Dec 31, 1942 23
Mar 6, 1979 22.73
Apr 1, 1940 22.7
Feb 26, 1961 21.68
Sep 11, 2018 21.08

Data provided by the National Weather Service.