SeaDory, When the river has the milky water the best shot at catching fish is plunking a spinnglo with a sandshrimp behind it. I think that chalky looking water is from glacier melt, the freezing level has been way up there the last few days. That paper looking stuff is from moss that grows on rocks in the river drying out when the river is low then getting washed off when the river comes up. It can get pretty bad in the fall when the first big rains come.