Northern Colorado – I-25 construction is in final finishing stages as crews continue to put traffic into final alignments on the newly widened roadway. As part of the project finishing operations, multiple nightly full closures of I-25 will take place to safely install new overhead signage structures above the active lanes of I-25 throughout the next few weeks.

Once fully complete, the project will increase capacity on I-25 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.

Travel Impacts

Full I-25 closures will take place from 9 p.m. to 5 a.m., nightly.

Night of Oct. 23 – Full closure of northbound I-25 from CO 402 to US 34.

• Detour: traffic will exit at Exit 255/CO 402 and turn west. Continue west on CO 402 to CO 287 and turn north. Continue to US 34 and turn east to access northbound I-25.

Night of Oct. 24 – Full closure of northbound I-25 from US 34 to Crossroads Boulevard.

• Detour: traffic will exit at Exit 257/US 34 and turn east. Continue to Centerra Parkway and turn north. Continue to Crossroads Boulevard and turn west to access northbound I-25.

Night of Oct. 29 – Full closure of northbound I-25 from CO 392 to Harmony Road.

• Detour: traffic will exit at Exit 262/CO 392 and turn east. Continue to Colorado Highway 257 and turn north. Continue to Harmony Road and turn west to access northbound I-25.

Nights of Nov. 1 – Full closure of northbound I-25 from Harmony Road to Prospect Road.

• Detour: traffic will exit at Exit 265/Harmony Road and turn right. Continue east to CO 257, turn left, and go north to Mulberry Street. Turn left on Mulberry Street and continue west to access northbound I-25. Northbound I-25 on-ramp from Prospect Road will remain open.

Nights of Nov. 2 and 5 – Full closure of northbound I-25 from Harmony Road to Mulberry Street.

• Detour: traffic will exit at Exit 265/Harmony Road and turn right. Continue east to CO 257, turn left, and go north to Mulberry Street. Turn left on Mulberry Street and continue west to access northbound I-25.

Nights of Nov. 6 and 7 – Full closure of southbound I-25 from Mountain Vista Drive to Mulberry Street/CO 14.

• Detour: traffic will use Exit 271/Mountain Vista Drive and turn left. Go to East Frontage Road, turn right, and continue south to CO 14/Mulberry Street. Turn right and continue west to the southbound I-25 on-ramp.

Night of Nov. 8 – Full closure of southbound I-25 from Mulberry Street/CO 14 to Harmony Road.

• Detour for southbound I-25: traffic will use Exit 269/Mulberry Street (CO 14), turn left and continue east to CO 257. Turn right on CO 257, continue south to Harmony Road and turn right. Continue to west the southbound I-25 on-ramp.
• Detour for Prospect Road to southbound I-25: traffic will go northbound on I-25 to Exit 269/Mulberry Street (CO 14). Turn left and go east to CO 257. Turn right on CO 257, continue south to Harmony Road and turn right. Continue to the southbound I-25 on-ramp.

Night of Nov. 13 – Full closure of southbound I-25 from Crossroads Boulevard to US 34.

• Detour: traffic will exit at Exit 259/Crossroads Boulevard and turn east. Continue to Centerra Parkway and turn south. Continue to US 34 and turn west to access southbound I-25.

Stay informed

More information about this project is available at:

Know Before You Go

Travelers are urged to “know before you go.” Gather information about weather forecasts and anticipated travel impacts and current road conditions prior to hitting the road. CDOT resources include:

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!

Download the COtrip App!

The new free COtrip Planner mobile app was designed to meet the growing trend of information on mobile and tablet devices for the traveling public. The COtrip Planner app provides statewide, real-time traffic information, and works on mobile devices that operate on the iOS and Android platforms. Visit the Google Play Store (Android devices) or the Apple Store (iOS devices) to download!