it would be rare, but Yew does grow in your parts. I have other ideas, but they aren't in front of me right now, but you should have some choke cherry and crab apple trees, mountain ash, and Douglas maple might grow in your area as well. I've seen some references to Yellow cedar being a decent bow wood, but haven't had a chance to tiller the pieces I have cut out. Serviceberry does grow there, but finding a thick and straight enough piece might be difficult.
good luck
Jamison