A beaver family built their lodge next to the Dutchess Rail Trail:
It’s just to the right of the fence post, on the far side of the pond.
Dutchess County’s aerial survey in 2016 showed a dry-ish area west of the rail trail, with a culvert to the north:
We went back the next day and stopped at the culvert. Their dam spans the entire near side of the pond, upstream of the ditch (just above my hand) leading to the culvert:
The helmet camera pictures look west from the rail trail, with the lodge in the northernmost open area. The wide-angle camera lens exaggerates the distance, but the lodge is only about 35 feet from the fence.
Go, beavers, go!