Due to the dams, diversions, and water resource development projects that occurred from the 1930’s to the 1960’s, the need for a national system of river protection was recognized by conservationists (notably Frank and John Craighead), congressional representatives (such as Frank Church and John Saylor), and federal agencies. The Act was an outgrowth of the national conservation agenda of the 1950’s and 1960’s, captured in the 1962 recommendations of the Outdoor Recreation Resources Review Commission. The Act concluded that selected rivers be preserved in a free-flowing condition and be protected for the benefit and enjoyment of present and future generations.
Source
Interagency Wild & Scenic Rivers Council