Having visited Woodsville and the Bath area where Maura disappeared, I figured the Ammonoosuc River was pretty tranquil. It hardly seemed more than a stream. In fact, there was so little water there in the summer I could walk across boulders sticking out of the river to get to the other side.
But this is what happens every year at the start of mud season, sometime in March.
That river would basically get rid of any evidence someone put in there. Scary stuff.