The Colorado Department of Transportation (CDOT), in partnership with the Federal Highway Administration, has released the Draft Environmental Impact Statement (DEIS) for the I-270 Corridor Improvements Project. The DEIS publication, now available in the Federal Register, begins a 60-day public comment period that will run until January 20, 2026.
The DEIS reviews possible options to enhance safety, mobility, and infrastructure along a six-mile stretch of I-270 between I-25 and I-70. It evaluates environmental, transportation, and community impacts while identifying a preferred alternative for future development. In addition to the federal document, CDOT has issued State Reports to comply with Colorado law on environmental improvements for capacity projects. These reports include detailed studies on greenhouse gas emissions and impacts on disproportionately affected communities and are open for public review alongside the DEIS.
According to CDOT, the preferred alternative proposes two general-purpose lanes and one new express lane capable of supporting transit in each direction. This design aims to improve safety and travel time reliability as well as transit and freight operations while providing enhancements for surrounding communities. The selection is based on technical analysis combined with input from stakeholders collected over several years.
“Publishing the DEIS is an important milestone for this corridor and for the communities that rely on it every day,” said CDOT Executive Director Shoshana Lew. “This process reflects years of technical work and community engagement. We encourage the public to review the documents and share their feedback so we can ensure the final plan meets local needs while improving safety, mobility and long-term sustainability.”
I-270 serves as a vital route within Colorado’s transportation system by facilitating regional travel, freight transport, and access to job centers. Much of its current infrastructure dates back more than five decades and does not meet present-day requirements.
Throughout project planning, CDOT engaged in extensive outreach efforts such as community meetings, corridor tours, listening sessions, online events, and collaboration with local governments as well as environmental justice groups. Public feedback played a role in shaping alternatives considered in the DEIS.
Both documents—the DEIS and State Reports—are accessible at codot.gov/projects/studies/i270study. Comments can be submitted online or at various locations including Commerce City Civic Center; Adams County Government Center; Eagle Point Recreation Center; Valdez-Perry Branch Library; Anythink Library Commerce City; CDOT North Holly Office; Bison Ridge Recreation Center; or CDOT Headquarters.
All received comments will be reviewed before preparing a Final Environmental Impact Statement.
