US 93 also provides the majority of the most direct connection from the major metropolitan areas of Las Vegas and Phoenix (via Boulder City, Kingman and Wickenburg with a final link to Phoenix via US 60) to the Boise, Idaho metropolitan area (with a final connection to Boise via Interstate 84 from Twin Falls, Idaho).

[citation needed] However, the revised numbering plan approved by the American Association of State Highway Officials (AASHO) on November 11, 1926 established US 93 from the Canada–US border near Eureka, Montana south through Montana and Idaho to a southern terminus at Wells, Nevada.

[5] The Nevada section was approximately 70 miles (110 km), commissioned along what was then the northern portion of State Route 13.

[10] The first major shift of US 93 occurred in 1967, when a new highway connection was completed between US 91 (now I-15) and a point 24 miles (39 km) northwest of Glendale.

The new alignment was oriented more north–south, shortening the distance between the Las Vegas area and Caliente by 23 miles (37 km).

In 1982, a "truck bypass" along the upper reaches of Hemenway Wash, to skirt the central portion of Boulder City and allow a straighter, more steady climb for commercial vehicles, was nearing completion.

US 93 was realigned again on October 19, 2010, when the Mike O'Callaghan–Pat Tillman Memorial Bridge over the Black Canyon of the Colorado River opened to vehicular traffic.

[12] In 2011, US 93 from Buchanan Boulevard to the Nevada terminus of the Hoover Dam Bypass was expanded to four through lanes with dedicated turn lanes at major intersections to better handle increased traffic loads from the Hoover Dam Bypass until its long-planned companion freeway around Boulder City was completed in 2018.

The most recent previous alignment (1982–2018) through the heart of Boulder City and along Hemenway Wash has now been re-signed as U.S. Route 93 Business.