North Entrance Road Historic District ID: 4183 | This file appears in: North Entrance Road Historic District North Entrance Road Historic District. Road between Mammoth Hot Springs and Mammoth Campground, facing north. | Creator: Lon Johnson | Date: May 2000 | Source: Montana State Historic Preservation Office | Rights: Public Domain Download Original File CreatorLon JohnsonSourceMontana State Historic Preservation OfficeDateMay 2000RightsPublic Domain "North Entrance Road Historic District" appears in: North Entrance Road Historic District