President Eisenhower signs the Federal-Aid Highway Act, authorizing the Interstate Highway System including I-70 through Colorado.
Federal Highway Administration officially designates the route for I-70 crossing Colorado from Kansas to Utah.
First construction on Colorado's I-70 begins on the eastern plains near Limon, the easiest terrain segment.
Major portions of I-70 through the Denver metropolitan area open to traffic, connecting eastern and western suburbs.
Ground breaking for the Eisenhower Tunnel, the highest vehicular tunnel in North America at 11,158 feet elevation.
Construction through Glenwood Canyon is postponed due to environmental concerns and engineering challenges in the narrow canyon.
The westbound Eisenhower Tunnel opens, eliminating the need to cross Loveland Pass and revolutionizing mountain travel.
The eastbound Johnson Tunnel opens, completing the twin-bore tunnel system through the Continental Divide.
Most sections of I-70 on Colorado's Western Slope are completed, including areas near Grand Junction and Rifle.
After years of planning, construction finally begins on the most challenging 12-mile section through Glenwood Canyon.
The innovative Hanging Lake Viaduct is completed, featuring elevated roadway to minimize environmental impact in the canyon.
The final 12-mile Glenwood Canyon section opens, completing I-70 across Colorado after 33 years of construction.
Official dedication ceremony celebrates completion of I-70 through Colorado, featuring the award-winning Glenwood Canyon design.