that such recreational use will not interfere with the primary purposes for which the areas were established, and
that funds are available for the development, operation, and maintenance of these permitted forms of recreation. This section shall not be construed to repeal or amend previous enactments relating to particular areas.
(Pub. L. 87–714, § 1, Sept. 28, 1962, 76 Stat. 653; Pub. L. 89–669, § 9, Oct. 15, 1966, 80 Stat. 930.)