Why should one support wild and scenic river designation?

Many individuals and communities support designation to help focus management efforts on protecting and enhancing river values. The intent of the Wild & Scenic Rivers Act is to build partnerships among landowners, river users, tribal nations and all levels of governments in developing goals for river protection. Designation provides strong protection against construction of new dams and projects that alter the free-flowing condition, water quality, and outstandingly remarkable values for which the river was designated.

Source
Interagency Wild & Scenic Rivers Council