Why does the Wild & Scenic Rivers Act contain a land acquisition provision?

Land acquisition is one tool for protecting and enhancing river values. It may also be an important means of providing public access to a wild and scenic river. Notwithstanding Section 6 of the Wild & Scenic Rivers Act, however, Congress has pre-empted some or all of the Wild & Scenic Rivers Act’s federal land acquisition authorities in the enabling acts for certain wild and scenic rivers where the river study demonstrated that protective zoning or other conservation practices provided adequate safeguards for river values.