Do they randomly turn repeater sites on and off just for fun?
They switch transmitter sites to get the coverage they need. If you listen to a fire or EMS page out, you will hear them transmit on several of the sites, one after the other.
I believe this is what you will hear:
155.025-Squaw, Sheriff's Office, Bellevue, and Saxon.
155.7075-Sheriff's Office, Bellevue, Saxon and Loveland Ski area.
155.745-Squaw, Sheriff's Office, Bellevue and Loveland Ski area.
155.61-Sheriff's Office, Bellevue and Loveland Ski area. (use to also be at Squaw)
155.175-Squaw and Loveland Ski area.
156.240-Squaw
Yesterday I believe they were using Bellevue primarily. Possibly there is an issue at Squaw such as the commercial power being off. Bellevue is north of Idaho Springs.
I don't listen to 155.7075 so I can't confirm that it is on the air at all the sites.