So funny to hear your story about your canoe trip. When I hiked the AT in 2002, I spent the first several days having the same experience you had. I thought I was hearing things, then I thought I was much closer to civilization that I expected and hearing lawn mowers, finally talked to other hikers and got the story.

I found my trail journal entry about this: https://www.trailjournals.com/journal/entry/14113