Actually heard activity on Brown, 151.400 yesterday. Seemed like it was related to holiday parking at a park. Not sure which one, but it was on a repeater and I think it was that distant machine referenced in my earlier post.
I will hear activity on Brown from time to time. Usually it's just radio checks and not actually anything useful except for the candle walk in the park in the fall.
Brown is very active around Devil's Lake SP. I'll hear maintenance, rangers, parking, and wardens. Sauk Co will contact wardens on the dispatch channel 155.7.
Our Conservation Officers in Illinois, operate on our State Police Troop dispatch frequencies. They also have car to car talk groups on the Statewide Motorola system. Some of our State Parks have local VHF repeaters including local DNR fire.