I-25 North Express Lanes: 120th to Northwest Parkway/E-470

north i 25 express lanes

From summer 2016 through winter 2019, CDOT and Hamon Infrastructure will build Express Lanes from 120th Avenue to Northwest Parkway/E-470.

This project will provide increased safety, capacity, and user choice to a rapidly developing region.

Project Facts

  • Cost: $97.5 million
  • Consultant(s): Hamon Infrastructure

In August 2011, CDOT completed a Final Environmental Impact Statement (FEIS) that includes the North I-25 corridor between US 36 and Colorado Highway 7—one of the most congested stretches of highway in the Denver metro area. This stretch sees an average daily traffic volume of 174,000 vehicles per day. The FEIS identified a preferred alternative for this corridor, which will offer increased safety, capacity and user choice.


  • Add capacity and ultimately provide the choice of a reliable trip with the addition of one HOV/Express Lane in both directions.
  • Install an auxiliary lane along northbound I-25 to connect the 136th Avenue on-ramp to the 144th Avenue off-ramp, which will help drivers merge more comfortably between the two interchanges.
  • Improve driving conditions by resurfacing the roadway.
  • Address necessary drainage and utility improvements along the corridor.

What are Express Lanes?

Express Lanes increase roadway capacity and help manage congestion on Colorado highways by adding lanes that provide a new choice to drivers. Motorists can choose to ride the bus, carpool or pay a toll to use the new Express Lanes as an alternative to the free, general purpose lanes.

Colorado: The Official State Web Portal