ASHLAND, Wis. (WRN) — The U.S. Army Corps of Engineers has finalized a permit allowing Enbridge to begin work on its Line 5 relocation project.

An Enbridge statement says work is already underway on staging and clearing for the $450 million, 41‑mile pipeline reroute around the Bad River Reservation. The company calls it the most studied pipeline project in state history that will bring millions in construction spending to northern Wisconsin.

Environmental groups and the Bad River Band have filed court petitions and are asking for an immediate halt to construction, arguing the Wisconsin Department of Natural Resources failed to fully evaluate environmental risks when it granted permits for the project.