The corner in the pic looks like Hanson’s. It is private property and after being overrun in a 49er type deluge the last few years they are now enforcing their property rights. Downstream from that corner about a mile or so you will find the boundary marker for the park which is run by NID. You can mine from that point downstream to the day use parking lot with non engine driven equipment on the East side of the river. The West side is private property. Up until a week ago the water flow was approx 40CFS and easy pickins. NID raised it to 450CFS so now not easy pickins. Good Luck and Stay Safe.