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Traffic Alerts

Information courtesy of CDOT, RTD, C-470 and others

Traffic Alerts – October 2020

This alert page is a one-stop-shop to keep up with construction, maintenance, and repair projects around Douglas County. Updates are added throughout the month as we receive information. Check back regularly to see what’s happening that might impact you.

Other Projects in Douglas County and surrounding areas that will affect traffic:

I-25 South GAP Projet

Extended closures and detours on I-25 between Larkspur and Monument for paving and traffic shifts starting tonight

Check project website for current information before traveling 

As part of the Colorado Department of Transportation’s Interstate 25 South Gap project, drivers along I-25 near Larkspur and Monument can expect delays from extended closures or short detours using the off- and on-ramps almost nightly until late-November as crews repair pavement and prepare for traffic shifts. Delays will be up to 30 minutes, mainly in the evenings and mornings.

Tonight, Oct. 30 from 8 p.m. to 8 a.m., drivers can expect a full closure of I-25 near Larkspur for drainage work. Detours will be via off- and on-ramps. 

Additional extended closures will be necessary over the next several weeks for pavement work. The asphalt pavement needs time to cool before I-25 reopens. Once these closures are complete, motorists will be driving on new pavement, which should minimize potholes and make for a safer drive this winter and during adverse weather. Overall, the project will place 850,000 tons of asphalt to provide a smoother driving surface along the entire 18-mile project work zone. To date, nearly 50% of paving is complete on the project.

Because asphalt work requires warmer temperatures, this work is heavily impacted by weather. Crews will complete as much paving as possible before winter, so the closure schedule is expected to vary and fluctuate with weather.

Motorists can expect almost nightly impacts through late-November and should check or the project’s Facebook page (@I25SouthGapProject) for up-to-date, detailed closure and detour information before traveling I-25 between Monument and Castle Rock. All work is weather dependent and subject to change. Generally, construction impacts are expected to include:



7 p.m. 11 a.m. Larkspur

Southbound I-25 closed at Sky View Lane/Tomah Road

Single-lane closure ONLY

8 p.m. 8 a.m. Larkspur

Southbound I-25 closed at Sky View Lane/Tomah Road

12-hour (weekdays) 6 p.m. 6 a.m. Larkspur

Northbound I-25 closed at Sky View Lane/Tomah Road

12-hour (weekends) 8 p.m. 8 a.m. Larkspur

Northbound I-25 closed at Sky View Lane/Tomah Road

(weekdays or weekends)
8 p.m. 5 a.m. Monument

Southbound I-25 closed at County Line Road

(weekdays or weekends)
8 p.m. 5 a.m. Monument

Northbound I-25 closed at County Line Road


If a closure is canceled due to weather or other unforeseen circumstances, crews will look for another opportunity to complete this important paving work. During these closures, drivers may see crews setting up cones and signs up to an hour prior to closure start time. There are no alternate routes, so drivers must stay the course on I-25 and plan for delays up to 30 minutes. Check for estimated travel times before driving through this area.

Check the I-25 South Gap website and Facebook page for current information on all closures. Text I25GAP at 21000 for text updates on all closures.

Ridgegate Parkway Widening

This project will widen RidgeGate Parkway from Havana Street to the City of Lone Tree limits from 2 to 6 lanes, to be initially striped for 4 lanes.  Construction will also consist of raised medians, left-turn lanes at signalized intersections, a separated cycle track, and an 8-foot sidewalk.  Construction is expected to start in the Spring 2019 and be completed by Spring 2021.  For more information visit

This is a City of Lone Tree Project – please contact Steve Fletcher ([email protected])

South I-25 Gap Construction Information 

For current impacts to drivers please visit

Road construction ramps up near Monument as part of I-25 South Gap project

Full overnight weekend closures of I-25; closure of Frontage Road continues through spring 2021  

Monument Hill Frontage Road Closure for seven months – a portion of the Monument Hill Frontage Road, east of mainline I-25 will be closed for approximately seven months to construct a wildlife underpass, replace drainage pipes, complete roadway construction and install a soundwall between northbound I-25 and the frontage road.  The closure will be located between the Colorado Heights Campground access points.  For more information visit Monument Hill Frontage Road Closure

Long-Term Larkspur Ramp Closures – As part of the I-25 South Gap project, three bridges near Larkspur are being rebuilt. Construction is underway on all three — Spruce Mountain Road, Upper Lake Gulch Road and the Plum Creek Bridge spanning over Plum Creek between Spruce Mountain Road and Upper Lake Gulch Road.

To maintain safety of the traveling public and construction crews, long-term closures of the Spruce Mountain Road on-ramp to northbound I-25 and the southbound I-25 off-ramp to Upper Lake Gulch Road will be required.

  • Spruce Mountain Road on-ramp to northbound I-25 – closed on Oct. 6
  • Southbound I-25 off-ramp to Upper Lake Gulch Road – closed on Oct. 25

Travel information is available at

All construction schedules are weather-dependent and subject to change.  While traveling through the work zone, please drive the posted speed limit, avoid distractions and increase your following distance. 

Project Contact Information

Project Hotline: 720-745-5435
Sign up for email updates: [email protected]
Text alerts: Text I25GAP to 21000
Project Facebook Page:
For current travel information and updates, check

Watch for changing traffic patterns. Throughout the work zone, speed limits will be a maximum 60 mph.  Pay attention!  Two lanes of travel in each direction of I-25 will remain open during daytime peak travel hours. 

For detour maps visit

Traffic Impacts

For upcoming traffic impact dates, detour maps and more information please visit

Stay informed about I-25 Gap construction:

Email alerts: Sign up online at
Text alerts: text I25Gap to 21000
Hotline: 720-745-5434
Email: [email protected]

Tomah Road / I-25 West Frontage Road Intersection Project

Phase II of the project will include upgrades to the BNSF Railroad crossing to accommodate a traffic signal at the intersection; this phase will take longer to coordinate with BNSF and CDOT, but we are hopeful to be able to complete the traffic signal in 2020.

Early Summer / Fall 2020 (Phase II): Anticipate construction to be completed