Bridge Demolition to Close I-25 at 84th Avenue Tonight and Tomorrow Night

June 1, 2011 - TRAFFIC ADVISORY - Denver Metro Colorado/CDOT Region 6 - DENVER – Tonight, June 1st and tomorrow night, June 2nd, the Colorado Department of Transportation (CDOT) will close all lanes of northbound and southbound I-25 near 84th Avenue for bridge demolition.

Lane closures will begin at 7 p.m. each night with the full closure of I-25 beginning at 10 p.m.  All lanes of I-25 and 84th Avenue will reopen by  5:30 a.m. the following day.  In addition, the northbound I-25 HOV/tolled Express Lane will be closed approaching 84th Avenue starting at 9 p.m.

“The 84th Avenue bridge will be demolished and replaced in three phases to allow us to keep 84th Avenue open throughout the project,” said CDOT Project Engineer Bryan Kalliokoski.  “For the first phase, we will be demolishing the northern portion of the bridge and then reconstructing it over the next several months.”

During the closure, motorists on I-25 will be detoured via the on and off-ramps at 84th Avenue.  While 84th Avenue will be open to traffic, motorists will not be able to make left turns onto 84th Avenue from I-25 or onto I-25 from 84th Avenue. In addition, only one lane of 84th Avenue will be open in each direction.

Major delays are possible on I-25 and 84th Avenue and alternate routes are strongly advised.  Motorists can take either Huron Street or Washington Street to 104th Avenue to avoid the construction zone.  CDOT would like to remind motorists to obey all construction signs and flaggers and to “Slow for the Cone Zone.”

This work is part of a project that replaces the 84th Avenue bridge over I-25.  The original bridge was constructed in 1959 and is one of Colorado’s poor bridges. The new bridge will be 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.

Zak Dirt, Inc. is the contractor for this $8 million project scheduled to be complete by the end of October 2012. The majority of 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 about 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-hand corner.  The link will take you to a list of items you can subscribe to including the “84th Avenue over I-25” project listed under “Projects.