The Denver metropolitan beltway dates back to the 1960's when an urban beltway was initiated by the Colorado Department of Transportation (CDOT) to serve the southwest quadrant of the metro area. The highway ultimately became C-470. Most, if not all, counties and municipalities in the Denver region included the beltway in their local transportation plans.The beltway was also included in the Denver Regional Council of Governments (DRCOG) long range transportation plan. As time passed, the E-470 Public Highway Authority was formed and over several years built the entire eastern portion of the beltway as a toll road. the Northwest Parkway Public Highway Authority (PHA) constructed the first nine miles of the northwest section of the beltway. In 2003, Arvada, Broomfield and Jefferson county initiated a local effort to complete the beltway's remaining 20 miles but postponed that effort at CDOT's request. CDOT then initiated the Northwest corridor Study. However, due to lack of funds to construct the project and CDOT's inability to satisfy the many objections of the City of Golden, CDOT officially dropped the project on June 9, 2008.

 Jefferson Parkway Public Highway Authority Establishing Contract

History of the Metropolitan Beltway