I am not familiar with Oregon law but if it's anything like California's then it only means that if the Feds delist a source of money dries up.
In PA and NY, we're trying to get timber rattlers delisted, on the grounds they're only rare in the places which don't have the rock formations suitable for denning.
While in PA it's now legal to take two rattlers if you have a current fishing license, it's going to be a long, uphill battle.