|Hoover Dam Access Road|
SR 172 highlighted in red
|Maintained by NDOT|
|Length||1.351 mi (2.174 km)|
I‑11 / US 93 / US 93 Bus. northeast of Boulder City
|East end||Hoover Dam Access Road west of Hoover Dam|
State Route 172 begins on Gold Strike Pass Road and Gold Strike Canyon Road, at an interchange with I-11/US 93/US 93 Bus. approximately 5 miles (8.0 km) northeast of downtown Boulder City. Proceeding northward for only a few feet, it turns right onto the old Nevada Highway, the original route of US 93. From there, the route travels eastward, following the curvy mountainside over Rough Summit headed toward Hoover Dam. Shortly after passing the turnoff for the Lakeview scenic viewpoint, the SR 172 designation ends 1.61 miles (2.59 km) west of the Arizona state line, just prior to a security checkpoint at the boundary with the Bureau of Reclamation's Hoover Dam Reservation. While the state highway designation ends at this point, the Hoover Dam Access Road continues eastward, passing the Mike O'Callaghan – Pat Tillman Memorial Bridge Plaza, the Hoover Dam visitor center, and then crosses the dam itself into Arizona. However, it only runs a short distance in that state before looping through a new parking area at a helipad to return the way it came, the original road past that point being blocked off to prevent all but dam personnel from continuing further south.
I‑11 / US 93 / US 93 Bus. north (Boulder City Parkway) – Kingman, Phoenix, Las Vegas, Boulder City
|Interchange; western terminus; I-11 exit 2; road continues west as Boulder City Parkway, south as Gold Strike Pass Road and east as Gold Strike Canyon Road; US 93 Bus. north was former US 93 north/US 466 west|
|1.35||2.17||Hoover Dam security checkpoint||Eastern terminus; road continues beyond security checkpoint as Hoover Dam Access Road; former US 93 south/US 466 east|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi|
- Nevada Department of Transportation (January 2017). "State Maintained Highways of Nevada: Descriptions and Maps". Retrieved May 6, 2017.
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