to be administered by the Secretary of the Interior as a scenic river. . (b) Effect The amendment made by subsection (a) does not affect valid existing water rights. 5. Existing rights and withdrawal (a) In general In accordance with section 12(b) of the Wild and Scenic Rivers Act ( 16 U.S.C. 1283(b) ), nothing in this Act or the amendment made by section 4(a) affects or abrogates existing rights, privileges, or contracts held by private parties. (b) Withdrawal Subject to valid existing rights, the Federal land within the boundaries of the river segments designated by this Act and the amendment made by section 4(a) is withdrawn from all forms of— (1) entry, appropriation, or disposal under the public land laws