Overnight Closure of Southbound I-25 Near Castle Rock Friday

Travel Advisory

June 4, 2020 - Central Colorado/Denver

DOUGLAS COUNTY – The Colorado Department of Transportation is preparing to place southbound Interstate 25 into its final alignment, requiring the highway to be closed south of Castle Rock.    

What: A full closure of SOUTHBOUND I-25 from Plum Creek Parkway to Sky View Lane (Tomah Road Interchange)

When: 8 p.m. Friday, June 5, through 8 a.m. Saturday, June 6

Why: The third and final traffic shift in the northern section of the I-25 South Gap project requires 23,000 feet of concrete barrier to be moved and the highway to be restriped.  A full closure is required to maintain safety for the construction crews and traveling public.

Detour: The West Frontage Road from Plum Creek Parkway to Sky View Lane (Tomah Road Interchange). The detour will add an estimated 15 minutes of travel time.  

PLEASE NOTE: The frontage road speed limit is 45 mph.

A similar final traffic shift on northbound I-25 currently is scheduled for late June.   

All construction schedules are weather-dependent and subject to change. In all construction zones, please drive the posted speed limit, avoid distractions and maintain a safe following distance. 

SB I-25 closure on I-25 S. Gap project, SB closed, detour route via W. FR, NB I-25 open

Project Contact Information

Project Hotline: 720-745-5435

Web: i25gap.codot.gov

Sign up for email updates: [email protected]

Text alerts: Text I25GAP to 21000

Project Facebook Page: Facebook.com/I25SouthGapProject

For current travel information and updates, check cotrip.org.

Remember to 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!

About the Project

CDOT is improving 18 miles of I-25 between Monument and Castle Rock by widening the highway from two to three lanes in each direction. The new lane will operate as an Express Lane, allowing motorists the choice of taking the Express Lane for a faster, more reliable travel time in exchange for a toll. Express Lanes will be free to vehicles with three or more people and motorcycles. All travelers will have the choice of taking the general-purpose lanes for free.

The $350 million project also includes shoulder widening, rebuilding bridges, new wildlife crossings, resurfacing with new pavement and modernizing technology. Project completion is scheduled for 202



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 Environment announced guidelines for construction activities. Gov. Polis issued 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 join the campaign for #DoingMyPartCO and avoid all nonessential travel. With fewer vehicles on the roads, CDOT crews will be able to work more efficiently and safely.


Whole System. Whole Safety.  

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 safety conditions for those traveling by all transportation modes. The program has one simple mission - to get everyone home safely.

About CDOT

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. Jared Polis has charged CDOT to further build on the state’s intermodal mobility options.