It runs from Hualapai Way at its western terminus to Las Vegas Boulevard in the east.

East of Las Vegas Boulevard, Spring Mountain becomes Sands Avenue, and then jogs south to join Twain Avenue.

SR 591 began at the intersection of Spring Mountain Road and Aldebaran Avenue.

From there, it proceeded east under Interstate 15 and terminated near Highland Drive.

Highland Drive intersects Spring Mountain Road in the form of a ramp from southbound Highland to westbound Spring Mountain, underneath I-15.