Nothing in El Rio Chama Scenic and Pastoral Act N.M. Stat. Ann. § 16-4-1 to 16-4-8 shall preclude the designated river from becoming part of the national wild and scenic rivers system. The secretary shall encourage and assist any federal studies for inclusion of El Rio Chama Scenic and Pastoral River in the national system and may enter into written cooperative agreements for joint federal and state administration of El Rio Chama Scenic and Pastoral River as a component of the national system. Such agreements shall recognize the established rights and culture of the area.