When an interagency incident command team starts managing an incident and the team is organized by a fire fighting team VHF-High is generally the only band used. Quite often flood incidents use more firefighters than any other profession. Such a team can order up radios from the National Incident Radio Support Cache (NIRSC), which uses VHF-High with UHF linking radios. How county deputies interface with VHF radios is something I don't know. The Nevada interoperability plan shows a large number of mountain tops that are equipped cross band patches for various frequencies. Maybe those frequencies and those of the NIRSC should be monitored. I understand an Urban Search and Rescue team from Las Vegas is being used. There are UHF frequencies assigned, on a national basis and maybe scanning those channels would yield some results. Then again, local systems might be enough for this incident.