The Carlin Tunnel comprises four tunnel bores situated in Nevada's Carlin Canyon. These tunnels were constructed to navigate a sharp bend in the Humboldt River. Two of these bores accommodate Interstate 80, while the remaining two serve the Union Pacific Railroad. Bridges spanning the Humboldt River are located near the entrances of three of the tunnels—the two freeway tunnels and one railroad tunnel. Each tunnel was built at different times for different purposes. The construction of these tunnels significantly improved transportation through the area.
In 1903, the Southern Pacific Railroad constructed the first bore of the Carlin Tunnel. This construction was part of a project to straighten the First Transcontinental Railroad, which previously followed the curves of the Humboldt River.
In 1908, a rockslide almost caused the collapse of the Southern Pacific tunnel, prompting extensive efforts to save the rail line.
In 1939, the City of San Francisco passenger train derailed on a Humboldt River bridge, resulting in 24 deaths and 121 injuries. The incident was deemed to be an act of sabotage.
Construction delays occurred in 1974. Fragmented rock during the boring process slowed progress, resulting in the completion date being pushed back.
On September 25, 1975, the third and fourth bores of the Carlin Tunnel were officially opened. These bores were constructed as part of Interstate 80 to handle increased traffic flow and higher speeds.
In 2008, another train derailment west of Carlin caused one of the Humboldt River bridges to collapse. This incident caused significant delays in national rail traffic.
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