Yakama Nation v. Klickitat County et al., affirming the reservation status of 121,465 acres within the southwestern corner of the Yakama Reservation, including Mt. Adams and the Glenwood Valley. That means the Yakama Nation has sole criminal jurisdiction in that area over tribal members, irrespective of any crimes they commit, barring those that necessitate involvement by the FBI.
The way I understand it all those timber companies still own their land and can allow hunting on it. Yakama Nation just has criminal jurisdiction in that area over tribal members.