Railroad Pass
The highway now numbered 722 was first constructed in 1924–1925 as part of improvements to the Lincoln Highway. The intent was to shorten the route by . While the route over Carroll Summit and Railroad Pass was shorter and more scenic, efforts began to revert to the New Pass Route as early as the 1930s. The route over New Pass Summit was being paved by 1967 and US 50 was re-routed back over New Pass Summit once finished.