It turned northeast on Smith Hill Road and then, as originally defined, along present Golden Gate Canyon Road (including about 1⁄2 mile (0.80 km) of modern SH 46) past Guy Hill.

[2] Some early maps, however, show the state highway following Crawford Gulch Road significantly north of Guy Hill.

[3] By May 1923, the west end had been shifted north to SH 119 north of Central City and Black Hawk,[4] and at about the same time the Golden Gate Canyon Road alignment was permanently adopted.

As part of a 1953 reorganization that eliminated a large number of state highways, SH 58 was cut back to its modern Denver-to-Golden extent.

[3] Media related to Colorado State Highway 46 at Wikimedia Commons