Bridge Replacement Project Underway at 84th Avenue and I-25

March 8, 2011 - Denver Metro Colorado/CDOT Region 6 - THORNTON – The Colorado Department of Transportation (CDOT) has started a project that will replace the existing 84th Avenue bridge over I-25 with one that is wider to accommodate an additional left turn lane from eastbound 84th Avenue to northbound I-25.

In addition, there will be 10-foot sidewalks on each side of the bridge to improve pedestrian and bicycle safety.

“The bridge was originally constructed in 1959 and is one of Colorado’s poor bridges,” said CDOT Project Engineer Bryan Kalliokoski.  “By replacing the new bridge, we are not only improving our transportation infrastructure, but improving safety and mobility.”

During the first two months of the project, crews will be conducting drainage work along the ramp from southbound I-25 to 84th Avenue.  Following this work, crews will begin to demolish and replace the existing bridge in phases, working from north to south.  This will allow CDOT to leave two through lanes open in each direction of 84th Avenue during peak hours.

Throughout the project, motorists can expect single lane closures on 84th Avenue from 9 a.m. to 3 p.m., Monday through Friday and 9 p.m. to 5:30 a.m., Sunday through Thursday.  Lane closures on I-25 can take place from 7 p.m. to 5:30 a.m., Sunday through Thursday.

Zak Dirt, Inc. is the contractor for this $8 million project scheduled to be complete by the end of October 2012.  The project is being funded by Funding Advancements for Surface Transportation and Economic Recovery (FASTER), which is dedicated to improving safety and replacing poor bridges.  The City of Thornton is funding the architectural enhancements such as the decorative lighting and bridge monuments.

For more information on the project, visit the project website at  To receive e-mail updates about the project, visit and click on the icon in the upper right corner under the search function.  You can then sign up for the “84th Avenue over I-25.” list under Projects.