45' - Flood waters begin to reach the Market Street Bridge in Williamsport.<br><br>41' - FEMA 0.2 0X0P+0nnual Chance Flood Level (500-year flood).<br><br>34.7' - Flood of record from Hurricane Agnes in 1972.  FEMA 1 0X0P+0nnual Chance Flood Level (100-year flood).<br><br>34' - Widespread flooding occurs in areas not protected by the levee system.<br><br>33' - Flood waters begin to reach the Arch Street Bridge in Williamsport.<br><br>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.<br><br>31.5' - FEMA 2 0X0P+0nnual Chance Flood Level (50-year flood).<br><br>30' - Many homes and businesses outside the levee system are affected by high water.<br><br>23' - Low lying areas on both banks are inundated. FEMA 10 0X0P+0nnual Chance Flood Level (10-year flood).<br><br>21' - A number of residences and roads in the area outside the levee system are affected.<br><br>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.<br><br>