Jonathan,
Basic data can be found at http://www.dot.state.co.us/App_DTD_DataAccess/GeoData/index.cfm?fuseaction=GeoDataMain&MenuType=GeoData
Also browse http://www.drcog.org.
What is an Iowa Stater such as yourself working on a Denver project for?
Best of luck, GO CYCLONES!
Zach Peterson (B.S. CRP Class of 1998)
zcarlin@gmail.com