I live on Mt. Hood, I KNOW about the Rain and Humidity you are dealing with, DO NOT put your wood directly on the ground. Pallets work great, metal "T" fence posts work well for your end bulkheads try to stack a little higher than your posts, and tarp. If you can either stack a little in from the pallet edge and tie your tarps so they are pulled away from the wood, would help, or use tent stakes to pull the tarps out even more from the wood is better if you can.
In our areas the important things are keep that wood off the ground, keep it DRY, and allow as MUCH air flow as possible
What part of the Coast Range are you in? We used to live in Forest Grove, and my Wife's Sister lives near Nehalem.
Doug