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green Historic RR Tunnels, Hoover Dam, & Bridge

  4.0 ( 22 ) Favorite


8.9 mile 14.3 kilometer loop


Ascent: 397' 121 m
Descent: -397' -121 m
High: 1,610' 491 m
Low: 1,295' 395 m


Avg Grade: 2% (1°)
Max Grade: 10% (6°)


No Dogs
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Trail shared by John Blackwell


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Hike through five tunnels with the end of the hike at Hoover Dam Visitor Center, then the bridge.

John Blackwell

Features Lake · Views · Wildflowers · Wildlife

Family Friendly A mostly level trail with great tunnels, bridges, and ending at the Hoover Dam.

No dogs allowed at the visitor center other than service dogs. Trail closes at sunset and reopens at sunrise. The trail currently stops at Tunnel 3 until further notice due to tunnel repair.


Enjoy beautiful views of Lake Mead as you hike along this old railroad path. The tracks have been removed. If you listen closely, you can hear the bats in the five tunnels that you pass through along the way.

Need to Know

Take some cash and have a hot dog or fries at the visitor center. This is one of the few trails in the area that has an elevator and cafe at the end.


The starting point for the hike is located at the Alan Bible Visitor Center near the intersection of Highways 93 (U.S.) and 166 (Nevada.) Either the upper parking lot at the visitor center or the lower lot a short distance toward the lake may be used.

The trail passes through five tunnels next to Lake Mead built for the rail line used during construction of Hoover Dam. A newly opened lower section continues downward and ends on the top floor of the parking garage at the Hoover Dam. Another trail junctions with this trail to take visitors to the walkway that crosses the Hoover Dam Bypass bridge.

The total out-and-back distances is four miles if stopping at the fifth tunnel or seven miles if going to Hoover Dam. You can add another two miles if you are going up to the bridge. Elevation change is negligible.

Flora & Fauna

There are big horn sheep in the area, and bats in the tunnels.

History & Background

This is the path that the workers were transported on while building Hoover Dam.

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May 24, 2019
Patty Brandon
Apr 19, 2019
Jeff Grissom
Dec 17, 2018
Brigham Redd
We parked at the look out point which is over the last tunnel (and also free) cuts the travel time in half if you’re short on time. 4mi
Nov 22, 2018
Timothy Beckman
The route is closed after the 4th tunnel due to degrading timber supports. Super easy walk with high wind in a couple spots. 3.3mi — 1h 07m
Nov 11, 2018
Michael D. Tomorsky
Windy 8.9mi
Apr 1, 2018
Bob Boyd
Not the full hike down to the visitor’s center. Very nice walk. 7.5mi
Feb 18, 2018
Erin Stob
Feb 15, 2018
Nice scenery. Fun tunnels. Easy and basic hike.

Trail Ratings

  4.0 from 22 votes


in Boulder City


  4.0 from 22 votes
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