Six week closure of pedestrian tunnel under I-25 near 120th Avenue

April 21, 2017 - Denver Metro Colorado/CDOT Region 1 - THORNTON – Starting on Tuesday, April 25 at 5 a.m. until mid June, the pedestrian tunnel to the RTD Wagon Road Park-n-Ride will be closed for 24 hours a day to complete the extension of both the east and west side of the tunnel as part of the North I-25 Express Lanes: 120th Avenue to Northwest Parkway/E-470 project.

The tunnel will be extended with new walls and updated sidewalks.

Extensions are necessary to provide extra width for the widening of I-25 and will consist of partial structure removals on both ends to accommodate construction. The removals and construction will create unsafe conditions directly adjacent to the traveled portion of the walkway; therefore, during this closure, the crews will complete the portions that cannot be constructed with pedestrians or cyclists present.  

All work is weather-dependent and schedules are subject to change.


  • Westbound - To access the trail from westbound Community Center Drive, travel north to Grant Street, west to 120thAvenue, and south to Delaware Street and rejoin the trail at the RTD Wagon Road Park-n-Ride.
  • Eastbound - To access the trail from the RTD Wagon Road Park-n-Ride, travel north to Delaware Street, west to 120th Avenue and south to Grant Street to rejoin northbound I-25.


The North I-25 Express Lanes project from 120th Avenue to Northwest Parkway/E-470 is a $97.5 million project that will improve safety, capacity and user choice to a rapidly developing region.  

This project will continue the previous Express Lanes project, which was completed on I-25 between US 36 and 120th Avenue, and will extend the Express Lanes to Northwest Parkway/E-470. The project will add capacity on I-25 up to Northwest Parkway/E-470 and construct a new asphalt surface from 120th Avenue to Colorado Highway 7. Motorists can expect the roadway to be in its final alignment by winter 2018. 

Construction will take place Monday through Friday, 7 a.m. to 4:30 p.m. with periodic night and weekend work. Motorists can expect various lane closures on both northbound and southbound I-25 as well as periodic ramp closures. Traffic will be maintained during peak travel times throughout construction.

CDOT, Hamon Infrastructure, the City of Westminster, the City and County of Broomfield, the City of Northglenn, the City of Thornton and Adams County would like to thank pedestrians and bicyclists for their patience during construction.

About Express Lanes: Express Lanes increase roadway capacity and help to manage congestion on the highways. The use of toll pricing during peak travel times reduces delays, manages congestion and maintains reliable travel times.Express Lanes currently are open between 120th Avenue and US 36 on North I-25 and, US 36 from Denver to Boulder and on the I-70 Mountain Express Lane. For more information, visit To get an ExpressToll account and pass, visit

Ways to Commute: Smart Commute Metro North is offering some incentives to help you commute smarter! Visit for more information. 


For additional information about this project, call the information line at 720-737-5118, email the team at[email protected], or visit the project website at For information on travel conditions, visit, sign up for GovDelivery, or call 511. Updates are also available via Twitter @coloradodot and CDOT’s Facebook page at