; and (II) the applicable land use plans adopted under section 202 of that Act ( 43 U.S.C. 1712 ). (2) Management of certain land with wilderness characteristics Any portion of the Federal land described in paragraph (1)(A) that was previously found to be lands with wilderness characteristics, as determined by the Secretary, that is not designated as wilderness under this Act, shall be managed by the Secretary in accordance with the applicable land use plans adopted under section 202 of the Federal Land Policy and Management Act of 1976 ( 43 U.S.C. 1712 ). (d) Wild and scenic river designations (1) In general Section 3(a) of the Wild and Scenic Rivers Act ( 16 U.S.C. 1274(a) ) is amended by adding at the end the following: (231) Owyhee river, oregon The approximately 14.7-mile segment of the Owyhee River from the base of Owyhee Dam in sec. 18, T. 22 S., R. 45 E., downstream to W 1/4 SW 1/4 sec. 13, T. 21 S., R. 45 E., to be administered by the Secretary of the Interior as a recreational river. . (2) Management (A) In general The Secretary shall manage the covered segment in accordance with section 6400 of the Bureau of Land Management Manual (Wild and Scenic Rivers) (as in effect on the date of enactment of this Act). (B) Livestock grazing (i) In general The Secretary shall manage domestic livestock grazing in the vicinity of the covered segment in a manner that protects the identified values of the covered segment, including maintaining existing structures used for livestock management. (ii) New structures To maintain the identified values of the covered segment, the Secretary shall ensure that any structures constructed after the date of enactment of this Act to facilitate livestock management in the vicinity of the covered segment are unobtrusive, as determined by the Secretary. (C) Invasive Species Management (i) In general In administering the covered segment, the Secretary shall carry out any activities that the Secretary determines to be necessary to prevent or control the spread of terrestrial invasive