All of them still have their conventional VHF systems in place. Okanogan is still primarily analog and I believe Wenatchee is also, however, they have added a P25 (Phase 1) capability to their VHF system. Kennewick, Lind/Steptoe (west and south of Spokane) and Colville are P25 simplex. Pend O'Reille County troopers work off of State Common (155.970). They have a repeater on that frequency on Kalispell Peak, which is analog.
I used to hear them a fair amount on JWIN, but that seems to have subsided. It was mostly the Colville and Republic (Ferry County) troopers that showed up on there but, I haven't heard them for quite a while.
The Spokane troopers are primarily on the Spokane Co TRS and it is interfaced to their VHF system. About 99% of the troopers operate on the County TRS. You can tell, because their RID's show up on whichever system they are on. They have a Car to Car TG on the county system also. You never hear any car to car traffic on any of the VHF freqs, unless the Air unit is working in the area.