I had something similar happen here in NY when I was in my teens

The Boy Scout troop I was with went up to the Catskills (western, up past Roscoe), on a Friday night, and was going to spend it's 1st night in this campground next to the Delaware River

About 1 hour after we get setup, we hear - "Get Up, get OUT NOW" - the river had just gone over its bank - we hand about 2 inches of water running through the lowest tents - by the time we grabbed a ran, I was up to mid shin - we, and everyone else in the campground got lucky that the owners were up, and it was only around 10pm. My midnight, there was a foot in the campground