Fred what do you have for updating Sierra to 4 NET's ??
Recently found some information that indicates they have Four (Admin, Fire, Service and LE)
Admin - 11 Repeaters
Fire - 10 Repeaters
LE - 3 Repeaters
Service - 4 Repeaters
Wiki has it as
RADIO SYSTEM
The Sierra National Forest has an "Emergency Net" and an "Admin Net." The emergency net is used by fire management and law enforcement. The admin net is for all other functions. Channels have been provided to enable direct or simplex communications on each net. The installation of 5 of 11 of the NIFC command frequencies in the primary group of channel assignments is unusual. Another unusual feature of the forest's radio system is that the repeater input or access tone is not transmitted on the output frequency, instead a different set of tones is transmitted on the output. For example, the input tone for the Shuteye Peak repeater is Tone 5 - 146.2, but the tone transmitted on the output frequency is 71.9. The assignment of the output tones of the remaining repeaters has not been determined. They are all in the lower frequency range of CTCSS tones, such as 71.9 and 77.0. The linking system the forest uses is to be determined. The system's hub remote base is likely on Musick Mountain or Mt. Givens.