Description
The Eisenhower bore (westbound tunnel) is 1.693 mi (2.72 km) long while the Johnson bore (eastbound tunnel) is 1.697 mi (2.73 km) long. The tunnels are sloped with a 1.64% grade, with an elevation of 11,013 feet (3,357 m) at the east portal and 11,158 feet (3,401 m) at the west portal. At the time of dedication, they were the highest vehicular tunnels in the world. The Eisenhower Tunnel remains the highest vehicular tunnel in the United States, however higher tunnels have since been constructed elsewhere, such as the Fenghuoshan Tunnel, a rail tunnel in China. The Eisenhower tunnel is noted as the longest mountain tunnel and highest point on the Interstate Highway system. The tunnel bores measure 48 feet (15 m) by 40 feet (12 m); however, the portion accessible to the public is a square shape measuring just over 16 feet (4.9 m) tall. The rest of the bore is used for forced air ventilation and water drainage systems.
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