Lot of good deer hunting around Dayton. Those same landowners can also be receptive if approached before the season. There is quite a bit of Feel Free To Hunt, Hunt by Written Permission near Dayton, as well as Forest and WDFW lands (Tucannon Wildlife Area) 15-20 east. Upper Tucannon all Forest Service.
Both Mule deer and whitetail....yes...three point minimum. Check season regulations.
Also might check at the Last Resort in the Tucannon. They are the ones who issue hunting permits for quite a bit of private lands in that area where all the wind turbines are visible. Here's their link....
http://www.thelastresortrv.com/Click the hunting and fishing report bar on the left....it describes the Wind Farm Access Program. Hope this helps. Oh...and all the country from Dayton to the Snake is good....more open.....same thing..permission or find Feel Free To Hunt etc.