Can't talk much on the system with locations, etc. but public safety and some tribal agencies are on the NXDN system. Other tribal and casino groups are being added in slowly as equipment becomes available. The old Passport side is no longer in use and there are still some LTR TG's active at the casino (which is the reason you are hearing analog transmissions).
CG, if the site you are describing is the one far down Route 2, that is no longer active. There is that other site that you can see towering from the reservation, that is still active. Its a little higher than the one located on the reservation.