Zayo Group Holdings, Inc. (NYSE: ZAYO) today announced plans for a new long haul fiber network between Salt Lake City, Utah and Denver, Colorado. Construction on the success-based route started last quarter and is anticipated to be completed in 2021.

The build will span more than 500 route miles along Interstate 70, a key transportation and commerce corridor. The route, which will be primarily underground, offers unique connectivity and diversity between Salt Lake City and Denver. Zayo’s existing route connects the two cities through Wyoming and into Utah.