Yesterday, while taking a leisurely cruise on the Columbia, above Bonneville dam, I noticed about a 18ft boat going down the river with no one in it

It was very close to the point of no return, where boats are not allowed, when I spotted it. We tried to see if anyone was missing or looking for one but nobody was around. Soooo, we decided that it was too dangerous by this time to go get it ourselves as it was now past the deadline. Goodbye boat! CRUNCH, CHOMP, the dam eats again!