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These vintage photos show how Colorado was built from the ground up

Posted at 7:25 PM, Jul 13, 2017
and last updated 2017-07-13 21:25:37-04

DENVER – As Colorado prepares to embark on a massive project to rebuild Interstate 70, we look back at past projects in the state that were just as ambitious.

The historic images in the following gallery features projects from Denver's viaduct era and various other road and bridge projects from across the state.

Click here to journey back in time, courtesy of the Denver Library’s digital collection.