I was down there last weekend and fished the river (banking it) just up from Wheeler. It was low water and very clear in most spots. didn't see any Coho, didn't catch any Coho, and didn't hear about anyone doing any better than i did.
If you want to take a break from chasing Coho..there are a few nice little trout spots on the way up towards Nehalem falls.
we also stopped in at the hatchery just for kicks and grins..doesn't look like the are expecting fish to arrive there any time soon.
They are supposed to be getting some fish in the bay/lower portion of the river, but it looks like that is still a boat only show.
good luck and let us (me) know how it went. i liked that area and plan on heading back down once things get going.