The department is authorized to acquire the remaining right-of-way for the Tribal Highway by purchase or by condemnation under state or federal eminent domain statutes. The secretary of transportation pursuant to the agreement is authorized to convey by deed to the governing authority for the Indian peoples of the Quinault Indian Reservation the right-of-way to the entire highway when fully acquired in return for a conveyance by the governing authority for the Indian peoples of the Quinault Indian Reservation to the state of Washington of a perpetual easement for public travel on the through lanes and shoulders of the highway when constructed. The agreement may also authorize the governing authority for the Indian peoples of the Quinault Indian Reservation to convey to the United States an easement to construct, maintain, and repair the highway improvements if such an easement is required by regulations of the bureau of Indian affairs.