I-270 Corridor Reconstruction and Express Lanes, Commerce City, Colorado

Interstate 270 north of Denver was built between 1965 and 1970 and hasn’t had a major upgrade since. That changed on Oct. 19, 2026, when the Colorado Department of Transportation broke ground on an $806 million I-270 reconstruction, with Kiewit as contractor.

It’s a short road that carries a lot. More than 100,000 vehicles a day use the link between I-25 and I-70, and heavy trucks make up 8% to 17% of that traffic. Over the past decade CDOT logged 160 planned maintenance jobs and 65 emergency repairs on the corridor’s bridges. At the groundbreaking, CDOT Executive Director Shoshana Lew described joints that shake under passing vehicles.

Project Scope

The work covers roughly six miles of mainline. (CDOT’s environmental documents describe a 6.5-mile study corridor from the U.S. 36 interchange to I-70.) Crews will replace 12 bridges, eight of them critical structures over the South Platte River, the Burlington Ditch, Brighton Boulevard and the Union Pacific and BNSF lines. The rebuilt mainline keeps two general-purpose lanes each way and adds one buffer-separated tolled express lane in each direction, the first express lanes on the corridor.

The rest of the package includes a rebuilt Vasquez Boulevard interchange, reworked I-76 ramps and a continuous auxiliary lane between Vasquez and York Street. Shoulders get wider, emergency turnarounds and a pedestrian overpass are added, and westbound I-270 will be raised between East 60th Avenue and the South Platte River Trail.

The budget is split three ways: $307 million for the critical bridges, $402 million for roadway reconstruction and $97 million for the remaining bridges and pedestrian crossings. The first phase runs to early 2030. Earthwork has started between the York Street and Vasquez interchanges, bridge replacement begins next spring, and the full program runs through 2033.

CDOT procured the critical bridges under construction manager/general contractor delivery. Its July 2026 dashboard put the preconstruction contract at $21.83 million with design 85% complete. No design firm was named in coverage of the groundbreaking.

Why It Matters

This is one of the Denver metro’s main freight links, and it’s been held together with patches. The Federal Highway Administration’s Sept. 8 record of decision closed a six-year environmental review. Earthjustice and GreenLatinos opposed the plan, arguing that more lane capacity won’t fix congestion and that Commerce City and north Denver neighborhoods carry the impacts.

Funding mixes state and federal sources, about $170 million of it federal, and the Colorado Transportation Investment Office will run tolling. CDOT says express lane revenue could help cover capital costs. That’s a forecast, not a pledge. It’ll depend on how drivers weigh a toll against free lanes that are also getting wider shoulders and an auxiliary lane.

CDOT has promised no daytime mainline closures during the first stage. On a corridor whose crash rate runs about 40% above comparable Colorado freeways, keeping that promise is its own test.

Project Team & Details