I'm gonna guess that there's no significant impact on the kinetic energy of the river very far downstream. There's constant resistance and it's at a relatively

I'm gonna guess that there's no significant impact on the kinetic energy of the river very far downstream. There's constant resistance and it's at a relatively low speed. Think of how quickly the river wouldn't be a river anymore if gravity suddenly ceased - it's virtually all potential energy being converted and lost to the surrounding environment and turbulence constantly. I would bet a lot of money that if you measured the kinetic energy in Oregon, you would find no statistical significance before and after a dam is built in Idaho.