Nevada State Route 172
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| Hoover Dam Access Road | ||||
Nevada State Route 172, highlighted in red
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| Maintained by NDOT | ||||
| Length: | 1.351 mi (2.174 km) | |||
| Existed: | 2010 – present | |||
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| West end: |
 US 93 northeast of Boulder City
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| East end: | Hoover Dam Access Road west of Hoover Dam | |||
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State Route 172 (SR 172) is a state highway in Clark County, Nevada. The route provides access to Hoover Dam from U.S. Route 93 (US 93).
State Route 172 begins on Gold Strike Canyon Road, at an interchange with US 93 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 back the way it came, the original road past that point being blocked off to prevent all but dam personnel from continuing further south.
SR 172 was originally part of US 93. US 93 was rerouted onto the Hoover Dam Bypass when construction was completed in October 2010, and the new state highway was designated over the old route.
The Nevada Interchange, built as part of the Hoover Dam Bypass Project that opened in 2010 and gave birth to SR 172, is being reconfigured as part of the I-11/US 93 Boulder City Bypass project. Once completed in 2018, the freeway will no longer end at this interchange, but veer off to the southwest, while new ramps will maintain connectivity to the present alignment of US 93 west of this point. That road will be redesignated and signed as Business Route 93 from this interchange into and through Boulder City.
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