How does each classification (wild, scenic, recreational) of a designated river affect future development on federal lands in the river corridor?

Wild and scenic river designation seeks to protect and enhance a river’s current condition. Generally, the classification of the river reflects the level of development at the time of designation, and future development levels must be compatible with such classification. Any proposed new developments on federal lands must be guided by land use and resource management objectives that are compatible with the river’s classification.

Source
Interagency Wild & Scenic Rivers Council