On February 20, 2013, the US89 – a key travel route to the communities in northern Arizona and to the Grand Canyon – suffered a crippling landslide forcing it to close. Working on an accelerated schedule, AZTEC took the lead on providing emergency engineering design and environmental compliance documents for the interim detour of US89 to restore essential traffic and mobility to the area by providing a safer, more direct detour around the landslide. We worked closely with ADOT and other stakeholders, including the Federal Highway Administration, Navajo Nation, and Bureau of Indian Affairs. The project included comprehensive quality control, geometric roadway design, earthwork modeling, signing design, pavement marking, drainage engineering, construction cost estimating, specifications and construction document packaging. The new interim detour shortened the previous detour by more than 50 miles and functioned for two years while the permanent repair was being completed on US89.