The Colorado Department of Transportation (CDOT), working 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 reviews options to improve safety, mobility, and infrastructure along a six-mile stretch of I-270 between I-25 and I-70. It analyzes possible environmental, transportation, and community impacts and names a preferred alternative. In addition to the federal DEIS, CDOT has issued State Reports that address requirements under Colorado law regarding environmental improvements for capacity projects. These reports cover topics such as greenhouse gas emissions and impacts on disproportionately affected communities. Both the DEIS and State Reports are available for public review and comment at the same time.
The preferred alternative described in the DEIS includes two general-purpose lanes and one new express lane that can accommodate transit in each direction. According to CDOT, this design is expected to improve safety, travel time reliability, transit and freight operations, as well as provide community benefits. The selection reflects 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 key part of Colorado’s transportation system by supporting regional travel, freight movement, and access to jobs. Much of its infrastructure is more than 50 years old and does not meet current standards for safety or operation.
CDOT has engaged in outreach efforts since starting the project. Activities have included community meetings, corridor tours, listening sessions, online open houses, as well as consultation with environmental justice communities, local governments, and other agencies.
The DEIS and State Reports can be accessed on CDOT’s I-270 Corridor Improvements website: codot.gov/projects/studies/i270study. The public comment period will end on January 20, 2026.
Comments will be reviewed by CDOT and FHWA before they finalize the Environmental Impact Statement. Input may be submitted 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; or CDOT Headquarters in Denver.
Public comments are used to refine project details, identify issues needing further study, and help balance transportation needs with environmental concerns during final design.
