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 document was published in the Federal Register and marks the start of a 60-day public comment period.
The DEIS assesses options to improve safety, mobility, and infrastructure along a six-mile section of I-270 between I-25 and I-70. It reviews potential impacts on the environment, transportation systems, and local communities while identifying a preferred alternative. CDOT has also made available State Reports that address requirements under Colorado Revised Statute § 43-1-128 regarding environmental improvements for capacity projects. These reports cover topics such as greenhouse gas emissions and effects on disproportionately impacted communities and are open for public review alongside the federal DEIS.
The preferred alternative described in the DEIS proposes two general-purpose lanes and one new express lane in each direction, designed to support transit use. According to CDOT, this design is expected to enhance safety, improve travel time reliability, benefit transit and freight operations, and provide community enhancements. The selection of this alternative is based on technical analysis as well as input from stakeholders gathered during several years of planning.
“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 key part of Colorado’s transportation system by supporting regional travel, freight movement, and access to employment centers. Much of its infrastructure is over 50 years old and does not meet current standards for safety or operation.
CDOT’s outreach efforts since starting the project have included meetings with communities, corridor tours, listening sessions, online open houses, and engagement with environmental justice groups as well as local governments. Feedback from these activities influenced which alternatives were studied in detail in the DEIS.
The DEIS and related State Reports can be accessed through CDOT’s project website at codot.gov/projects/studies/i270study. The public comment period will end on January 20, 2026.
All submitted comments will be reviewed as agencies prepare the Final Environmental Impact Statement and related decision documents. Comments may be provided online, by mail, or at upcoming public hearings scheduled for January at 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; and CDOT Headquarters.
Public participation is intended to help refine project details, identify areas needing further study, and ensure that transportation solutions balance environmental considerations with community needs.
