An act to designate certain National Forest System lands in the Mendocino and Six Rivers National Forests and certain Bureau of Land Management lands in Humboldt, Lake, Mendocino, and Napa Counties in the State of California as wilderness, to designate the Elkhorn Ridge Potential Wilderness Area, to designate certain segments of the Black Butte River in Mendocino County, California as a wild or scenic river, and for other purposes.