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Interstate 70 (I-70) is a mainline route of the Interstate Highway System in the United States connecting Utah and Maryland. The Utah section runs east–west for 232.15 miles (373.61 km) across the central part of the state. I-70 was the second attempt to connect southern California to the east coast of the United States via central Utah, the first being a failed attempt to construct a transcontinental railroad.
Portions of I-70 were constructed in areas where previously there were no paved roads. I-70 has many features that are unique in the Interstate Highway System. For example, the 110 miles (177 km) between Green River and Salina makes up the longest distance anywhere in the Interstate Highway System with no motorist services. This same piece is noted as the longest highway in the United States built over a completely new route since the Alaska Highway, and the longest piece of Interstate Highway to open at a given time. The construction of the Utah portion of I-70 is listed as one of the engineering marvels of the Interstate Highway System.
The choice of the route had a significant impact on the character and culture of the Sevier Valley. I-70 from Green River to Grand Junction, Colorado is part of the Dinosaur Diamond Prehistoric Highway, a National Scenic Byway. Attractions on or near I-70 include, Arches National Park, Canyonlands National Park, Cleveland-Lloyd Dinosaur Quarry, Goblin Valley State Park and Westwater. The designation lists several side roads branching from I-70 that lead to dinosaur bones or footprints.
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