When SR 175Y was designated in August 1935 , it replaced a section of SR 717 .
The route ran from SR 175 near the eastern end of the original causeway onto the island north along Main Street to the northern border of Chincoteague .
When SR 175Y was designated in August 1935 , SR 175 replaced a section of SR 717 .
The route ran from SR 175 near the eastern end of the original causeway onto the island north along Main Street to the northern border of Chincoteague .