ASHLAND, Wis. (WRN) — Hearings are underway for a contested pipeline project in northern Wisconsin.

Enbridge operates the 645-mile Line 5 pipeline from Superior to Canada through Michigan and the Straits of Mackinac. The Canadian company wants to build a 41-mile-long portion of the existing Line 5 that would go around the Bad River Chippewa Band’s reservation.

Environmental groups and the band have challenged state permits. Construction unions backed the project. Federal, state and local permits are still needed before work starts.

Hearings began Tuesday at Northwood Technical College in Ashland and will continue in Madison and Ashland through September 29. A hearing schedule can be found at the Wisconsin DNR website.