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Try around cle elum and ellensburg. Just like deer or elk hunting you are going to have to put in the leg work and time.
Never hunted Cle Elum/Ellensburg area ... usually just Stevens, Ferry and Lincoln Counry (further east). If I was you, I would contact the game warden and/or forest rangers in the area you want to go and pick their brains for info oof where to start (they usually are very helpfull ... also local UPS or other local delivery drivers often are helpful. Your buddies may also have friends and/or family in the area which is always a plus ... I've even got great info from motel personnel, waitresses, store clerks, etc.I would stop my truck in good looking areas, walk at leat a hundred yards out, and use a locator call or two. Check for droppings, feathers, tracks, or other signs the birds are frequenting the area. The more time and shoe leather you devote now means greater chance of success later.