After months of hard work, the 120th Ave. Improvements Project is complete. Residents and visitors now benefit as congestion and commute times are greatly reduced, with the stretch from Sylvia Drive to the N Line now three lanes in both directions instead of two.

The project also included stormwater improvements for the roadway and its surrounding areas, a new traffic signal at Race Street, and walking paths on both sides of the street.

“Whether driving, biking or walking, our residents and visitors will instantly recognize the improvements in this area,” said Mayor Pro Tem Shannon Lukeman-Hiromasa. “We’d like to thank everyone involved in making this project become a reality, and we sincerely appreciate the public’s patience with construction.”

The planning began in 2021 and was funded by the Denver Regional Council of Governments (DRCOG) through the Transportation Improvement Program and administered by the Colorado Department of Transportation. The federal grants amounted to $9.48 million and required a 20% match, which was paid by the city and partners — Karl’s Farm Development and the City of Thornton.

American West Construction was awarded the project in April of 2022 and began in January. Despite historic rain levels in 2023, the project was completed ahead of schedule.

“The new improvements will reduce traffic congestion and make our roads safe,” said Council Member Becky Brown. “I know our surrounding residents will really appreciate the upgrade.”


Mayor Pro Tem Shannon Lukeman-Hiromasa cuts the ribbon to celebrate the completion of the 120th Avenue Improvements Project. Joining her were staff from the city and contractors and others who worked on the project.