The Current River Greenway is a 263 hectare (650 acre) greenway located in Current River neighbourhood in the north end of Thunder Bay, Ontario along the Current River. Throughout the Greenway is 50 km of public trails that are part of the Thunder Bay Recreational Trails and the Trans Canada Trail system. Five kilometres of paved trail circle Boulevard Lake. Part of the trail system incorporates the Black Bay Bridge, North America's first single spandrel, reinforced concrete bridge, which was built in 1911. The trails around Boulevard Lake are also used for various walking marathons in support of local and national charities. Trails outside of the Boulevard Lake area are not paved.