A hard isolated shower anywhere upstream can cause temporary muddiness. I have seen a small tributary stream heavily muddied by a hard isolated downpour muddy a big stretch of river for a time. On the upper white, when there is a big wind, Sequoyah will get temporarily muddy and the spillway is only a little bit upstream from the Wyman gauge. A bit of gravel mining will also cause intermittent turbidity. I wish the COE would crack down on gravel mining in the upper White, Middle, and West forks.