120th Avenue Connection

Project completed

About the Project

Crews are in the final phase of this project, for which they're building a new, six-lane portion of Colorado Highway 128 and a bridge over US 36 that connects with Wadsworth Boulevard. This will connect CO 128 and 120th Avenue.

Crews also are constructing a grade separation at the BNSF Railroad. Additionally, a storm sewer will be constructed from 120th/US 287 to Main Street.

April 2018 Progress
Crews have opened a new concrete portion of US 287 east of Upham Street for eastbound traffic. They're also completing caisson for the retaining wall, and will excavate beneath the rail road after the caisson work.

Project Facts

  • Cost: $90.1 million (the final phase costs approximately $30 million), funded by the City and County of Broomfield, the Federal Highway Administration and CDOT
  • Contractor: Jalisco International, Inc.
  • Timeline: July 2009 - September 2018
  • Location: The project extends along 120th Avenue from Wadsworth Parkway, across US 36 to approximately 120th Avenue and Teller Street, then down existing 120th to Main Street.

Completed Phases

In September 2010, the Colorado Department of Transportation and the City and County of Broomfield completed the first two phases of the 120th Avenue Connection project (construction phasing map)

The $51 million project (includes design, right of way and construction) constructed a new six-lane portion of State Highway (SH) 128 and a bridge over US 36 that connects with Old Wadsworth Boulevard where access to 120th Avenue is available. Once the final phase is complete, the new portion of SH 128 will be extended to connect directly to 120th Avenue.

Prior to this project, motorists in the Broomfield area could only cross US 36 at Wadsworth Parkway.  Now that the SH 128 bridge over US 36 is complete, motorists can access 120th Avenue by taking the new portion of SH 128 to Old Wadsworth Boulevard.  Once on Wadsworth Boulevard, travel west on 118th Avenue and then north on Commerce Street where access to 120th Avenue is available.  The route provides for the safe travel of motorists, pedestrians, and cyclists.

Edward Kramer and Sons, Inc. was the contractor for the first two phases of the project and HNTB was the design firm.  The project started in September 2009 and was completed on time and within budget.

This project was funded with approximately $39 million in federal funds, $1 million in state funds and $11 million City and County of Broomfield funds.