The Detroit News and the Detroit Free Press report a waiver on a policy requiring that only U.S. steel be used went into effect this week.
Backers of the project say they're pleased by the decision on the waiver, which was sought by Michigan Gov. Rick Snyder.
Mark Butler, a spokesman for Transport Canada, applauded the waiver, calling it vital for the construction of the international span.
The owners of the Ambassador Bridge, which currently connects Detroit and Windsor, objected to the waiver.
They want to build their own second bridge across the Detroit River.