What are the roles of the Department of Transportation and the river-administering agency under Section 4(f) of the Department of Transportation Act?

The Department of Transportation (DOT), in coordination with the river-administering agency, performs compliance reviews for qualifying properties. While Section 4(f) requires that the river-administering agency’s recommendations for minimizing harm are considered during the planning process, the authority to administer and make Section 4(f) approvals ultimately resides with the DOT. The river-administering agency’s concurrence on any DOT Section 4(f) compliance documents should clearly state that its concurrence is contingent upon a favorable final determination for the project under Section 7 of the Wild & Scenic Rivers Act.

Source
Interagency Wild & Scenic Rivers Council