Rio Grande Designation Act of 1992 - Amends the Wild and Scenic Rivers Act to designate a segment of the Rio Grande, New Mexico, as a component of the National Wild and Scenic Rivers System.
Designates another segment of the Rio Grande for potential addition to the System.
Directs the Secretary of the Interior to establish the Rio Grande Citizens Oversight Review Board to advise the Secretary on the implementation of a management plan for the designated river segment.
Withdraws such lands from appropriation or disposition under U.S. public land, mining, and mineral and geothermal leasing laws.