Granite Falls PD is working off their OPS talkgroup 37984.
Hudson PD often uses their OPS 38192 as does Caldwell SO on their DISP 37920.
Caldwell EOC contacts Granite Falls on the GPD TG.
All are digital mode.
Hibriten Mtn. is the best site to hear all this activity from. Control channel is 868.3250, site 13 in Zone 4 (SysID C92D).
Linville, High Peak, Baker catch some of the radios also.