Cherry creek gun club, but not Cherry Creek Family center at cherry creek state park. They have a two lane underground 100 yard tube. Located roughly at Parker rd and Mississippi in aurora. Cherry Creek gun club is a private membership club though, have to be a member and it has gotten expensive last few years. $300/year plus $100 initiation. Gave up my membership when I moved out east 12 years ago.

http://www.cherrycreekgunclub.org/