Folks,
STRONPERSUADER spoke to me earlier and I was wrong. I was going by what was said in a conversation with the State Park once. I checked with Brian Andrews, Law Enforcement Manager, and received the following reply:
"We only allow handicapped persons using [snowmobiles, ATV's] as mobility devices for the purpose of accessing lake for ice fishing. ADA law takes precedence over park rules prohibiting. No joy riding, no passengers, only for mobility and operator assumes all responsibility for ice conditions. ATV's and Snowmobiles must be registered."
I apologize for my error regarding this.
RangerJulie