 State Highway 470 ( C @-@ 470 , SH 470 ) is the southwestern portion of the Denver metro area 's beltway . Originally planned as Interstate 470 in the 1960s , the beltway project was attacked on environmental impact grounds and the interstate beltway was never built . The portion of " Interstate 470 " that was built as a state highway is the present @-@ day SH 470 , which is a freeway for its entire length . 
