March 23 (Reuters) - The U.S. Army Corps of Engineers on Thursday extended the federal permitting process for Enbridge Inc's proposed Great Lakes Tunnel that would house the Line 5 oil pipeline underneath the Straits of Mackinac in the Great Lakes.

Canadian pipeline company Enbridge said it was "disappointed" with the decision, which will delay the start of construction until 2026. (Reporting by Nia Williams; Editing by Leslie Adler)