Reconstruction of the Prospect Road and I-25 interchange  requires closure of Prospect Road and ramps to I-25 over this weekend

Travel Advisory

April 14, 2020 - Northeastern Colorado - I-25 closure under Prospect slated for April 25-26

FORT COLLINS A full weekend closure of Prospect Road over I-25 and the associated I-25 on- and off-ramps is planned from 9 p.m. April 17 to 5 a.m. April 20 to allow for crews to move traffic onto the newly constructed bridge.

The I-25 North Express Lanes Project is currently reconstructing the Prospect Road bridge over I-25 to accommodate the addition of Express Lanes on I-25. The new bridge will have two through lanes and center turn lanes in each direction and a bike and pedestrian lane. These improvements are scheduled to be complete in late 2020. 

Work on the expanded bridge is currently being performed away from traffic. However, in order to switch traffic onto the newly built section of the Prospect Road bridge over I-25 and tie-in to the new ramps, a full weekend closure of Prospect Road over I-25 and the associated I-25 on- and off-ramps is required. The closure will be in place from 9 p.m., Friday, April 17, to 5 a.m., Monday, April 20. CDOT’s commitment to highway safety through their Whole System Whole Safety initiative deems these closures necessary to protect motorists from potential danger posed by construction work and equipment staged on the roadway. 

When traffic has been switched to the newly built section, the existing bridge will be demolished. This will require a full closure of I-25 at Prospect Road in both directions from 9 p.m., Saturday, April 25 to 9 a.m., Sunday, April 26.

Detours for traffic impacts: Friday, April 17 – Monday, April 20

  • Eastbound and westbound Prospect Road over I-25 full closure detour map here. (insert link to map)
  • Northbound and southbound I-25 off-ramps to Prospect Road full closures detour map here. (insert link to map)
  • Northbound and southbound I-25 on-ramps from Prospect Road full closures detour map here. (insert link to map)

Detours for traffic impacts: Saturday, April 25 – Sunday, April 26

  • I-25 under the Prospect Road bridge full closure detour map here. (insert link to map)

Project Information 

The I-25 North Express Lanes: Johnstown to Fort Collins Project will increase capacity by adding an Express Lane in both directions, constructing inside and outside shoulders, and replacing aging bridges. The project will also improve multimodal access to regional transit to promote mode shift, improve bus service performance by adding new bus slip ramps from I-25 to the new Park-n-Ride at Kendall Parkway, and improve interchanges at CO 402, Prospect Road and US 34.

Prospect Road Closure Detour map eastbound and westbound      

I-25 off-ramps from Prospect Closure detour map at Mulberry Street and West Frontage Road  I-25 Full Closure Under Prospect Road detour map at Exit 268



Safe transportation infrastructure is essential for emergency first responders and freight drivers as Colorado navigates the COVID-19 pandemic. With that in mind, construction continues on CDOT projects with social distancing and other measures to reduce COVID-19 exposure on the worksite. The Colorado Department of Public Health and the Environment has promulgated guidelines for construction activities. Gov. Polis announced an emergency, temporary stay-at-home order for all of Colorado, which went into effect Thursday March 26. With this order, the public is urged to #DoYourPartCO and avoid all nonessential travel. With fewer vehicles on the roads, CDOT crews will be able to work more efficiently and safely.



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.