I-270 Corridor Improvements Study

About the Project

Corridor Overview

Interstate 270 (I-270) runs from Adams County towards Boulder County in North Denver. Every day, more than 100,000 vehicles travel the highway. Nearly 10 percent of its daily traffic is freight trucks. The congested interstate carries far more traffic than it was designed for. The pavement and bridges are stressed by the traffic loads, and emergency repairs are needed regularly. The corridor also lacks safe and efficient walking, cycling, and public transportation options for residents and businesses near the highway. 

Culturally diverse neighborhoods surround the I-270 corridor and rely on and are affected by the interstate. The state identifies these communities as “disproportionately impacted” meaning these areas have large communities of color, are lower income, have higher housing cost burdens, and are at risk of experiencing higher levels of health or environmental impacts. 

The Colorado Department of Transportation (CDOT) and the Federal Highway Administration (FHWA) began a National Environmental Policy Act (NEPA) process in 2020, initially anticipating an Environmental Assessment. Moving into 2023, CDOT determined a more detailed environmental review was needed and requested an Environmental Impact Statement (EIS) be initiated.  A Notice of Intent to prepare an EIS for this project is anticipated to be published later this year.

Schedule & Important Dates

  • Next Public Meeting: October 10, 2023
  • Draft Environmental Impact Study Available for Public Comment: Fall 2024
  • Environmental Study Completion: Winter 2025

I-270 Corridor Improvements Study Area

I-270 Neighborhoods Base Map

I-270 Neighborhoods Base Map

The purpose of the I‐270 Corridor Improvements project is to:

  • Implement transportation solutions that modernize the I-270 corridor to accommodate existing and forecasted transportation demand.

The identified transportation needs are as follows:

  • Traveler safety.
  • Transit on the corridor.
  • Bicycle and pedestrian connectivity across I-270.
  • Travel time reliability.
  • Freight mobility.


  • Minimize environmental impacts (including air quality, greenhouse gas emissions, community impacts) from the project.