A joint venture partnership between Barnard Construction Co. and Civil and Building North America will take charge of constructing the Great Lakes Tunnel beneath the Straits of Mackinac.

Enbridge Energy will issue requests for proposals in the coming weeks for contractors to construct a $500-million Great Lakes tunnel to carry crude oil and natural gas liquids through the Straits of Mackinac between Michigan and Ontario.

County judge closes damaged and undamaged legs of 67-year-old line, with June 30 date set for owner to provide update on pipe condition.