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"On this Day in History"



On this day in 1968, construction starts on the north tunnel of the Eisenhower/Johnson Memorial Tunnel on Interstate 70 in Colorado, some 60 miles west of Denver. Located at an altitude of more than 11,000 feet, the project was an engineering marvel and became the world’s highest vehicular tunnel when it was completed in 1979. Four months after opening, one million vehicles had passed through the tunnel; today, some 10 million vehicles drive through it each year. This tunnel cost $117 million to construct and at the height of the building process, some 1,140 people worked three shifts, 24 hours a day, six days a week. The south tunnel cost $145 million and employed 800 workers, approximately 500 of whom were involved in drilling operations.

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L.J. Ferrari
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