DOT will close CO 56 over I-25 for approximately 140 days starting Aug. 1

Travel Advisory

July 27, 2021 - Northeastern Colorado - Closure required to start safety and operational reconfigurations for the interchange

WELD COUNTY — Starting Aug. 1, at 9 p.m., the Colorado Department of Transportation will temporarily close the Weld County Road 44/Colorado Highway 56 bridge over I-25 for up to 140 days as part of the I-25 North Express Lanes project between Berthoud and Johnstown.

Shortly after CO 56 is closed over I-25, the northbound I-25 on- and off-ramps at CO 56 will also close for a period not to exceed 70 days. The southbound I-25 on- and off-ramps at CO 56 will remain open with minor intermittent night and weekend closures during the 140-day closure. 

This closure is required for crews to safely and efficiently reconstruct the interchange into a new configuration. While the roadway is closed, construction crews will flip the interchange so I-25 runs over CO 56, instead of under it, as it is currently. Without the closure, flipping the interchange would not be possible. The new configuration will correct unsafe curves for a safer traveling experience while improving interstate traffic flow. Closing I-25 will not be necessary to facilitate this work. When completed, the interchange will also include two new roundabouts at the northbound and southbound ramps, and the carpool lot will be relocated from the southeast quadrant to the northeast quadrant of the interchange. The interchange will be complete in summer/fall 2022.

An extensive list of construction activities, in addition to reconfiguring the interchange, will be performed during this closure. A variety of detours will be in place as work progresses. Go to for up-to-date detour maps. 

The I-25 North Express Lanes Project, Berthoud to Johnstown team held a virtual public meeting on Tuesday, June 29, and presented closure information to the public. The meeting recording is available on the project website for additional closure and overall project information.

About I-25 North Express Lanes: Berthoud to Fort Collins

The I-25 North Express Lanes Project will increase highway capacity by adding an Express Lane in each direction, rebuild interchanges, replace aging bridges, straighten highway curves to improve safety, make major utility and drainage improvements, and add carpool and two mobility hub transit facilities. During construction on the I-25 North Express Lanes Project, motorists should expect speed reductions to 55 or 65 mph, minor lane shifts, temporary concrete barriers and median bridge work. Motorists should also expect delays during the scheduled work hours. Construction is expected to be complete in early 2024.

Project Contact Information

  • Project phone line - (720) 593-1996

  • Project email – [email protected]

  • Project web site -

  • Sign up for weekly project updates by logging onto the project web site and filling out the right-side form to “Subscribe to Project Updates.”

About CDOT

CDOT’s Whole System-Whole Safety program has one simple mission — to get everyone home safely. Our approximately 3,000 employees work tirelessly to reduce the rate and severity of crashes and improve the safety of all modes of transportation. The department manages more than 23,000 lane miles of highway, more than 3,000 bridges and 35 mountain passes. CDOT also manages grant partnerships with a range of agencies, including metropolitan planning organizations, local governments and airports. It also operates Bustang, the state-owned interregional express bus service. Gov. Jared Polis has charged CDOT to further build on the state’s intermodal mobility options. 

Remember: Slow For The Cone Zone

The following tips are to help you stay safe while traveling through maintenance and construction work zones.

        Do not speed in work zones. Obey the posted speed limits.

        Stay Alert! Expect the unexpected.

        Watch for workers. Drive with caution.

        Don't change lanes unnecessarily.

        Avoid using mobile devices such as phones while driving in work zones.

        Turn on headlights so that workers and other drivers can see you.

        Be especially alert at night while driving in work zones.

        Expect delays, especially during peak travel times.

        Allow ample space between you and the car in front of you.

        Anticipate lane shifts and merge when directed to do so.

        Be patient!