I heard two OSP Coos Bay Fish & Wildlife troopers talking on ODF Fire Tac 8 151.490 with a PL of 131.8 yesterday...I had no idea that OSP uses ODF tacs. I didn't get enough of the conversation to hear what they referred to the frequency by name as.
Its probably the same channel. I'm assuming they probably have a statewide mutual agreement with ODF. I have heard OSP on ODOT tacs as well. And someone said on here that all channels are capable of direct mode as well, so I bet they have hundreds of options.