to be administered by the Secretary of Agriculture in the following classes: (A) Mainstem The segment from the confluence of the Middle Fork Smith River and the South Fork Smith River to the Six Rivers National Forest boundary, as a recreational river. (B) Rowdy Creek (i) Upper The segment from and including the headwaters to the California-Oregon State line, as a wild river. (ii) Lower The segment from the California-Oregon State line to the Six Rivers National Forest boundary, as a recreational river. .