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CDOT outlines preferred I‑270 express‑lane alternative; final EIS expected in 2026
Summary
CDOT told Commerce City officials it has selected a preliminary preferred alternative for I‑270 that reconstructs the corridor, adds an express (toll) lane in each direction to prioritize transit, widens shoulders, and reconstructs bridges; CDOT estimates total project cost at about $806 million and plans phased construction beginning in late 2026.
Colorado Department of Transportation officials presented an update on the I‑270 corridor draft environmental impact statement (DEIS) and described a preliminary preferred alternative that would add an express (toll) lane in each direction while reconstructing the corridor’s bridges, ramps and shoulders.
Jenna Hahn, Commerce City’s director of public works, introduced CDOT representatives who said the DEIS public‑comment period ran from Nov. 1 through Jan. 20, 2026; CDOT will address substantive public comments and aims to finish a final EIS in 2026, subject to NEPA scheduling uncertainties. CDOT said the study area covers the 6.5‑mile stretch from I‑70 to I‑25 and includes interchanges at I‑76, York Street, Vasquez Boulevard and Quebec Street.
CDOT explained the preferred alternative reconstructs the entire corridor, adds an express lane in each direction that would be free for HOV (3+), motorcycles and transit, institutes dynamic tolling for other users, widens shoulders and improves ramp geometry to reduce merging/weaving crashes. CDOT said the preferred alternative reduces crashes by roughly 15–20%, cuts peak‑period delay by more than 20,000 vehicle hours per day and reduces peak‑hour truck travel times by nearly 20 minutes.
Funding and phasing: CDOT estimated the full preferred‑alternative cost at approximately $806 million (pre‑construction plus construction). To date CDOT has spent about $41 million since 2020 on planning and bridge work. Construction will be delivered in three phases so higher‑priority bridge and safety work can proceed first; CDOT anticipates starting construction in late 2026 with a roughly five‑year timeline contingent on funding.
Mitigation and community commitments include noise walls where warranted, water‑quality ponds, air‑quality monitors, expanded pedestrian and bicycle crossings, new RTD stops and exploration of a tolling‑equity program to reduce impacts on lower‑income travelers. CDOT said it will continue monthly community engagement and coordinate with Adams County and Commerce City public works on commitments.
What’s next: CDOT will respond to DEIS comments and refine alternatives; local officials requested continued coordination around tolling equity and mitigation measures and sought clarity about schedule and funding for planned phases.
