This area is part of the old Boise Cascade Veneer plant in downtown St. Helen’s OR. The city has been started developing this area for a larger park section.  Towards the far end of the trail you’ll see the concrete slabs from where the old buildings were. There is a large hill/pile/mound of broken up concrete chunks resembling rocks. This is a great place for crawlers. 1/10, 1/6, 1/8.  There are other mounds around that mini might be fine on.