Check out the old swing bridge.
The dam was a wooden crib structure (consisting of criss-crossed logs with rock fill) that really started falling apart in the 1970s, but it was still about six feet high when their raft went over the waterfall. This is the dam in a 1900 photo:
Sweeps us away; our life’s a dream,
An empty tale, a morning flow’r,
Cut down and withered in an hour.
This is from the 2006 book Enfield, Connecticut Carved in Stone by Bob Clark:
Read The Windsor Locks Canal Trail, Part 1.