Why were the Interagency Guidelines for the wild and scenic rivers program developed?

On September 7, 1982, the Departments of Agriculture and the Interior outlined in the Federal Register (47 FR 39454) eligibility and classification criteria, the evaluation process and content, and reporting requirements for potential wild and scenic rivers and management guidelines for designated wild and scenic rivers. These guidelines were formulated to provide a uniform evaluation and consistent management approach in the identification, evaluation, reporting, and management of wild and scenic river segments. These replaced earlier guidelines developed in 1970.

Source
Interagency Wild & Scenic Rivers Council