Southern Utah Open OHV Areas Act This bill directs the Department of the Interior to convey specified land owned and managed by the Bureau of Land Management (BLM) in Washington County, Utah, to the state of Utah in exchange for specified state lands. Upon the conveyance of the nonfederal land to Interior, such land shall be used only: (1) as an open riding area for the use of off-highway vehicles; or (2) for any other public purpose consistent with uses allowed under the Recreation and Public Purposes Act. Interior shall convey, without consideration, specified Open OHV Areas managed by the BLM to Washington County. Interior shall convey to the county, without consideration, all right, title, and interest of the United States in and to the (Open OHV Areas) land managed by the BLM and identified as Hurricane Sand Dunes (NRA). Such conveyed land shall be used only as: (1) an open riding area for the use of off-highway vehicles, or (2) for any other public purpose consistent with uses allowed under the Recreation and Public Purposes Act.