US 85 Corridor Improvements (State Highway 67 to County Line Road)

Updated July 14, 2015



In 2002, CDOT and Douglas County completed a South I-25/US 85 Environmental Impact Statement (EIS) and Revised Record of Decision (ROD) outlining a set of improvements to address transportation needs in the region.  Since then Douglas County has helped provide funding assist CDOT with construction improvements on several segments of US 85. As additional residential and commercial growth occurs in the northwest portion of the county, further studies are needed to identify what transportation improvements are necessary to support the development. Accordingly, in the summer of 2015, Douglas County initiated two important studies of US 85. The two studies are separate but will be closely coordinated at each step in the process which allowed several opportunities for citizen and corridor stakeholder input.  For more project information please visit

Douglas County US 85 Corridor Study (PEL Study completed January 2017)

The goal of the Douglas County US 85 Corridor Study, known formally as a Planning and Environmental Linkage (PEL) Study, is to update previous recommendations for transportation improvements to US 85 from approximately State Highway 67 in Sedalia to 1/2 mile north of County Line Road.  The study will help the county and other agencies identify the long term transportation needs beyond 2040 – though many of the identified improvements could be implemented much sooner.  The project will team identified a “Purpose and Need” that focused on addressing traffic concerns including accidents and was used to direct information gathering and development of alternatives.  The Corridor Study identified a corridor vision and implementation plan, outlining the environmental clearances and design steps required to build the recommended improvements in the future when needed.

Douglas County US 85 Early-Action Project (currently underway)

The goal of the Early-Action Project is to update the 2002 Record of Decision (ROD) to address changes to conditions that have occurred since it was issued by the Federal Highway Administration (FHWA), and to analyze impacts of recommended improvements for Highlands Ranch Parkway to C-470. Douglas County was selected to receive $15 million in 2019 in federal funds from the Denver Regional Council of Governments to help partially fund construction of the estimated $45 million Early-Action project.  The Early-Action Project identified corridor improvements needed to improve capacity, operational performance and safety for anticipated traffic volumes in 2040.  The project team anticipates the FHWA will approve the Environmental Re-Evaluation by the summer of 2017, and the County initiated final design in the fall of 2016.  The next steps, late 2017, will be to acquire additional right-of-way needed to accommodate the widening of U.S. 85 from 4-6 thru lanes.  In 2018, staff anticipates several utilities will need to be relocated which could impact traffic.


For more information please contact Art Griffith, (Douglas County Transportation Capital Projects Manager), via email at