Notice of Road Closure on Mt. Lehman Road: Please be advised that Mt. Lehman Road is currently under construction, view the site plan and will be closed to vehicle traffic between Simpson Road and Marshall Road from Monday, August 19 to Sunday, August 25, 2019, 24 hours a day. View detour information. Visitors to YXX must give themselves ample time to travel to and from the airport and should expect delays. View the project details.