 Interstate 70 ( I @-@ 70 ) is a transcontinental Interstate Highway in the United States , stretching from Cove Fort , Utah to Baltimore , Maryland . In Colorado , the highway traverses an east – west route across the center of the state . In western Colorado , the highway connects the metropolitan areas of Grand Junction and Denver via a route through the Rocky Mountains . In eastern Colorado , the highway crosses the Great Plains , connecting Denver with metropolitan areas in Kansas and Missouri . Bicycles and other non @-@ motorized vehicles , normally prohibited on Interstate Highways , are allowed on those stretches of I @-@ 70 in the Rockies where no other through route exists . 
