Family Friendly: Nice, easy grades. There can be a fair amount of traffic, but you can typically hear cars coming a long way off.
Miller Fork Road parallels Hell Creek to the Miller Fork Recreational Preserve parking area where it turns from a well-travelled gravel road to a narrower and slightly harder dirt road. This is a very beautiful area and this is a great easy/moderate ride. Beware of heavy climber traffic around noon on nice days.