This file contains four dual sport routes in the west central upper peninsula of MI. Arvon Loop 199 miles Gwinn-Silver DS track. 117 miles. Connected Bass Lake and Porterfield single track loops. Iron track. 132 miles OHM (unlicensed) Gwinn-Porterfield. 104 miles. Connects single track at Porterfield and Bass Lake trails. 18,711 views on my previous track site. Did not record the downloads for this set.