As a long time easten Sierra local I should be an expert on all the systems here, but sadly, due to age and some major traumas, my cognitive functions have decreased. I haven't tried to figure out Inyo County's MRA system at all. The rumor is that CRIS is coming to Mono County and will include everthing from the S.O. to school busses. Mammoth PD will generate most of the traffic.
Rather than the 700 Mhz systems that CRIS is on in most of the rest of the state, it will use VHF-High. Rumor also includes the CHP being encrypted on CRIS and I assume they will be using VHF High as well. Some of the electronic sites are spitting out the data channels already. Given the distances and topography CRIS will be an improvement, as it will tie all areas of the county together. No more having dispatch announcing that southern units needing to hold traffic for higher priority traffic in north county. I haven't heard anything about encryption, but I won't be surprised if it arrives.