The Secretary shall expeditiously acquire such lands, and undertake such developments and improvements, as may be necessary to provide for commercial and noncommercial access to the river near Cunard. No restriction shall be imposed on such access based on the time of day, except to the extent required to protect public health and safety.

Pending completion of the developments and improvements referred to in subsection (a), the Secretary shall permit the motorized towing of whitewater rafts in the section of the national river between Thurmond and Cunard when the volume of flow in the river is less than three thousand cubic feet per second.