Traffic Advisory: New Lane Alignment Coming to Southbound I-25 Near Plum Creek Parkway in Castle Rock

June 6, 2019 - Metro Denver, Colorado

WHAT: As part of the Interstate 25 South Gap project, the roadway will be restriped into a new lane alignment 

WHERE: Southbound I-25 approaching Plum Creek Parkway in Castle Rock

WHY:  Currently, there are four lanes along southbound I-25 in this area. Motorists in the far-right lane are required to exit at Plum Creek Parkway. The other right lane is a through-or-exit lane. Crews will re-stripe the road so both right lanes must exit at Plum Creek Parkway. The new configuration will increase safety for motorists and crews by moving the merge point out of the I-25 South Gap construction zone, which begins just south of Plum Creek Parkway.

HOW:  Crews will re-stripe the roadway and replace the overhead exit sign. Crews will work two consecutive nights—requiring overnight lane and shoulder closures—starting as far north as Wolfensberger Road. Ramp closures at Wolfensberger Road and Plum Creek Parkway will also be required. 

WHEN: Remember: All construction schedules depend on weather.

Monday, June 10, 8 p.m. to 5 a.m.: Wolfensberger Road on-ramp to southbound I-25 and southbound I-25 off-ramp to Plum Creek Parkway closed. Drivers should use Plum Creek Parkway to access southbound I-25.

Tuesday, June 11, 8 p.m. to 5 a.m.: All southbound I-25 traffic will exit at Plum Creek Parkway and re-enter southbound I-25 using the Plum Creek Parkway on-ramp. Motorists will then continue traveling southbound I-25 in a single lane using the right shoulder for approximately a mile so crews can complete roadway re-striping. 

PICTURED BELOW: With the new alignment, lanes 3 and 4 will be required to exit right to Plum Creek Parkway. Lanes 1 and 2 will continue to be through lanes.

Plum creek 6-6-19.png

Project Information
Project Hotline: 720-745-5435
Sign up for email updates: [email protected]
Text alerts: Text I25GAP to 21000
Project Facebook Page:

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 will occur in 2022.
Travel options to improve commutes are available during construction. Some of the services include a new Bustang route from Colorado Springs to the Denver Tech Center. CDOT is partnering with the Denver Regional Council of Governments' Way to Go program to provide more commuting options, such as incentives to vanpool and carpool. Visit to learn more.

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