I did both. Lack of bank access on the lower Siletz made me come back and I hit the Salmon under the 101. While there was certainly a fair amount of folks there, it wasn't as "shoulder to shoulder" as I had feared. So, good times. Everyone I talked to on the Siletz hadn't caught or seen any fish. One guy on the Salmon said he saw a few fish caught up river (which I'm assuming means up towards the hatchery) and there were plenty of fish to be seen. Nobody got into any while I was there, but, I was only there for an hour or two.
Thanks for the suggestions guys.
Cheers.