1975 Gousha Map of Denver showing proposed Interstate 470.
Funds previously allocated for I-470 were earmarked not only to the Centennial Parkway corridor, but also to improvements on U.S. 85 (Santa Fe Drive) and other transportation improvements throughout the region. Construction got underway for Centennial Parkway in 1982, as Colorado 470. Design changes made by that time included interchanges in place of signalized intersections.
Referred to as C-470, Centennial Parkway opened in stages with the last section completed in October 1990. While Colorado 470 is a freeway, there are right in right out (RIRO) connections along westbound at Colorado 75 (Columbine Hills) and Hampden Avenue (Bear Creek Lake Park).
Starting in the 1990s and continuing through the 2000s, the Denver Beltway was extended east to Aurora and north to Broomfield as a toll road via Extension 470 (“E-470”) and the Northwest Parkway. These sections were never considered for inclusion in Interstate 470.