Construction starts Sunday on the I-25 North: Berthoud to Johnstown Express Lanes Project at CO 56

September 25, 2019 - Northeastern Colorado

WELD COUNTY — Starting Sunday, Sept. 29, the Colorado Department of Transportation will begin construction on the I-25 North: Berthoud to Johnstown Express Lanes Project, the next phase of improvements along I-25 to Fort Collins. 

Construction will start with reconstructing the southbound I-25 bridge over Little Thompson River, as well as elongating the southbound on-ramp from Colorado Highway 56 to allow for a safer merge to the truck climbing lane.

The bridge and acceleration lane fix -– along with the complete reconstruction of the CO 56 interchange --  are scheduled to be complete in 2021. Initial work will include various lane closures along I-25 as crews set barrier to prepare the work zone. 

When the entire project is complete in 2023, it will add an Express Lane in each direction of I-25, replace aging bridges, make interchanges safer and more efficient, and improve infrastructure for bus transit along the I-25 corridor.

The $250 million project will also replace carpool facilities, create new pedestrian and bicycle access and improve the alignment of I-25 for safer travel as part of CDOT’s Whole System – Whole Safety initiative.


Please visit the website,, for the most current travel updates. Work on the first phase will take place on southbound I-25 between mile points 255 and 243. Construction will typically take place Monday through Friday from 7 a.m. to 5:30 p.m., with occasional nighttime lane closures from 9 p.m. to 5 a.m. Motorists should expect speed reductions to 65 mph, minor lane shifts, temporary concrete barriers and median bridge work. Motorists should also expect delays during the scheduled work hours. Work on this phase (????)  is expected to be completed in early 2021. Construction is weather-dependent and subject to change.

During construction, two lanes of traffic on I-25 will be maintained in each direction during peak travel times, but drivers can expect overnight lane closures in the area. In addition, lane and shoulder widths will be minimized and speed limits will be reduced. Please pay attention and follow posted signage. 

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Project Limits of Construction Work Zone


  • Project phone line - (720) 593-1996

  • Project email – [email protected]

  • Project web site -

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


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!


To heighten safety awareness, CDOT recently announced its Whole System — Whole Safety initiative. This project takes a systematic statewide approach to safety combining the benefits of CDOT’s programs that address driving behaviors, our built environment and the organization's operations. The goal is to improve the safety of Colorado’s transportation network by reducing the rate and severity of crashes and improving the safety of all transportation modes. The program has one simple mission—to get everyone home safely.


CDOT has approximately 3,000 employees located throughout Colorado, and manages more than 23,000 lane miles of highway and 3,429 bridges. CDOT also manages grant partnerships with a range of other agencies, including metropolitan planning organizations, local governments and airports. It also administers Bustang, the state-owned and operated interregional express service. Gov. Polis has charged CDOT to further build on the state’s intermodal mobility options.