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Historic RR Tunnels, Hoover Dam, & Bridge

  4.1 ( 23 ) Favorite


8.9 mile 14.3 kilometer loop
99% Runnable


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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Map Key

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

John Blackwell

Features Lake · Views · Wildflowers · Wildlife

No dogs allowed at the visitor center other than service dogs. Trail closes at sunset and reopens at sunrise. Trail is now open—cargo boxes are in place to make a covered tunnel to protect from falling objects.


Enjoy beautiful views of Lake Mead as you run 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.

Runner Notes

A mostly level trail but this area can get very crowded.


The starting point for the run 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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Apr 30, 2019
Kellan Morgan
Jan 12, 2018
Jason Wheat
Jan 10, 2018
Juan Caride
Apr 24, 2017
Steve Homner
Apr 19, 2017
Bill Schmelzer
beautiful run along ridge, fun stop at hoover dam for a water break. ran witj Robert H. 8mi

Trail Ratings

  4.1 from 23 votes


in Boulder City


  4.1 from 23 votes
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145 Views Last Month
3,241 Since Nov 6, 2015



Hoover Dam from above.
Nov 12, 2015 near Boulder…, NV
Lake Mead, Historic Railroad Trail
Jan 13, 2018 near Boulder…, NV
Hoover Dam.
Dec 4, 2018 near Boulder…, NV
Tunnel Number Three.
Nov 6, 2015 near Boulder…, NV
Right up against the Hoover Dam.
Nov 12, 2015 near Boulder…, NV
Lake Mead Overlook
Nov 12, 2015 near Boulder…, NV


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