Interstate 70

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Interstate 70 marker

Main route of the Interstate Highway System
Main • Auxiliary • Business

Interstate 70 (I-70) is an Interstate Highway in the United States that runs from Interstate 15 near Cove Fort, Utah, to a Park and Ride near Baltimore, Maryland. It was the first Interstate Highway project in the United States. I-70 approximately traces the path of U.S. Route 40 (and also the old National Road) east of the Rocky Mountains. West of the Rockies, the route of I-70 was derived from multiple sources. I-70 is the fifth longest Interstate Highway, after I-90, I-80, I-40, and I-10.

The construction of I-70 in Colorado and Utah is considered an engineering marvel as the route passes through the Eisenhower Tunnel, Glenwood Canyon, and the San Rafael Swell. The Eisenhower Tunnel is the highest point along the Interstate Highway system with an elevation of 11,158 ft (3,401 m).

The sections of the interstate in Missouri and Kansas have laid claim to be the first interstate in the United States.[2] Though disputed, the Federal Highway Administration has claimed the section of I-70 through Glenwood Canyon, completed in 1992, was the last piece of the Interstate Highway system, as originally planned, to open to traffic.[3]

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