I remember my folks had friends that lived in a big old house down river aways from Williamsport - RIGHT down on the river. When it finally crested, it was about knee high on the second floor.
Also knew numerous people that were washed out out on the Loyalsock and the Lycoming Creeks.
Sounds like my neighborhood. I was in Richmond a few years ago when Hurricane "?" came thru (it started on land in the N.C. Outer Banks) and it literally shook the hotel. Thankfully the worst storm I've ever had to live thru. BTW, shout-out from Western PA.