Welcome from another in the PNWet. If you are in the Portland area, take a look at the Portland and Vancouver chapters, and if from Salem down look at Brownsville (mine).
As to highbankers, go to Oregon DEQ, 600 permit. I don't know if they are issuing them right now or not. You will have to have some kind of settling pond setup so no muddy/dirty water is returned to the stream (statewide). If it is a combo unit, no dredging on Burnt, is 303 listed for Arsenic.
DEQ has the 700 PM permit for dredging, but small weekend warrior types outside of ESH generally don't need the DSL general authorization permit. Info on the 700PM is available on their site.