The route's south terminus was adjusted back to Bardine in 1939, and a small gap at McClure pass was opened. By 1954, a large section of the route was deleted, leaving only a four-mile (6 km) road near Carbondale.
In 1939, the southern terminus of the route was repositioned to Bardine, and a small opening was created at McClure pass. By 1954, a substantial portion of the original route had been removed, leaving behind only a four-mile road segment near Carbondale.