Maps Here are some scans of historical maps.
This is from Rand McNalley's 1927 road atlas and shows routes as they were proposed by the Bureau of Public Roads plan. Note the swastika on the Arizona marker. This was actually taken from a Native American design. It was removed in the 1940s, after it became associated with the Nazis. This was designated AZ 69 until the dam was completed in 1936, when it became US 466 .