The department with the approval of a majority of the legislative delegations of the counties adjacent to the waters of the Savannah River between the Stevens Creek Dam and the highway bridge between Calhoun Falls, South Carolina, and Elberton, Georgia, including the waters impounded by the Stevens Creek Dam and the Clark Hill Dam, all in Game Zone No. 2, may amend the regulations set out in Section 50-19-2220 or make new ones as they become desirable.