The rapids are very treacherous, and each year several people die here. Rivers for kayaking are divided into categories 1-5 based on difficulty. The North Fork of the Payette River (on this picture), is a number 4 I think. We saw lots of kayakers including one that tipped under and then came back up.
A little further down from the last picture is the little town of Horseshoe Bend, population 707. You know you are in a different part of the country when there is a plea for support to help a family's baby that was born with a heart defect, and the lottery prizes in the raffle they set up to help them financially with health care bills include three things: a chain saw, a new rifle with a spotting scope, and a large box of ammunition. That would not happen in New Jersey.