16 U.S.C. § 797a: Congressional authorization for permits, licenses, leases, or authorizations for dams, conduits, reservoirs, etc., within national parks or monuments

On and after March 3, 1921, no permit, license, lease, or authorization for dams, conduits, reservoirs, power houses, transmission lines, or other works for storage or carriage of water, or for the development, transmission, or utilization of power within the limits as constituted, March 3, 1921, of any national park or national monument shall be granted or made without specific authority of Congress.