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Traffic Alerts

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

Traffic Alerts – August 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:

C-470 Express Lanes Project

C-470 Express Lanes between I-25 and Wadsworth Boulevard are open for testing

The C-470 Express Lanes between I-25 and Wadsworth Boulevard are open for testing.  Motorists will be able to use the new lanes for free until mid-August 2020 during the testing phase of the toll system.

For  more information visit C470ExpressLanes, 24-hour hotline at 303-347-0507.

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])

I-25 Ramp Metering Project

Crews will complete minor work on various on-ramps along north and southbound I-25 in Douglas County.  Activities will not cause significant traffic impacts, with a localized and temporary shoulder closure in place.  The typical working hours are from 7 a.m. – 5 p.m.

Email: [email protected]


South I-25 Gap Construction Information 

For current impacts to drivers please visit

June 25 – early August – 45-day closure of the southbound I-25 on- and off-ramps at Greenland Road beginning at 6 p.m. Thursday, June 25, so crews can reconstruct the ramps into a new configuration, complete earthwork, install drainage and remove unsuitable material in the area. Motorists will be detoured to County Line Road near Monument or Upper Lake Gulch Road during these 45-day ramp closures (Detour maps below. Note that the underpass itself is open.)

Monument Hill Frontage Road Closure Coming Soon – During the week of Aug. 9, crews plan to close a portion of the Monument Hill Frontage Road, east of mainline I-25 for about 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