Along the route to this point, runners will also run through a number of small tunnels along the trails, which originally were constructed as railroad tunnels in the early 1930s and were used to transport men and materials back and forth between Boulder City and the Hoover Dam, which was then in the process of being built over a period of five years, between 1931 and 1936, in the depths of the Great Depression.
The dam’s distinctive pale concrete arch is known across the nation, and runners get their chance to see its Nevada side — it connects Nevada with Arizona — after following the Historic Railroad Hiking Trail all the way to the Hoover Dam parking lot.