What happens when a river authorized for study under Section 5(d)(1) of the Wild & Scenic Rivers Act is determined not suitable for designation?

A Section 5(d)(1) study river is protected to the extent of each study agency’s authority and not by the Wild & Scenic Rivers Act. Each agency’s policy is to protect eligible rivers and rivers determined suitable for designation for the life of the respective agency land use plan. A river determined not suitable for designation need no longer be protected as a potential addition to the National Wild & Scenic Rivers System once the study, with its related decision document, is completed.

Source
Interagency Wild & Scenic Rivers Council