Southbound I-25 Traffic Shift from County Line to RidgeGate to Occur Overnight Saturday

September 10, 2015 - Denver Metro/CDOT Region 1 - DENVER – Overnight on Saturday, Sept. 12, crews will shift southbound I-25 traffic onto new concrete pavement in the center of I-25.

Motorists should expect a southbound single lane closure starting at 8 p.m. and double lane closures at 11 p.m. while crews move barrier wall and install temporary striping for the new configuration, which will be in place until November.

This traffic shift signifies the start of Phase 5 of the I-25 Widening Project between RidgeGate Parkway and County Line Road. Once the traffic shift is in place, crews will be able to reconstruct the west side of highway. Phase 5 will finish construction of the southbound I-25 travel lanes and shoulder as well as make ramp improvements at the County Line on-ramp, C-470 / E-470 on-ramp and Lincoln Avenue ramps.

Motorists are encouraged to use extra attention when approaching the work zone from the north. All three lanes of southbound I-25 will shift to the east starting near the C-470 / E-470 interchange. Approaching Lincoln Avenue, the two left lanes will be split from the other southbound lanes for approximately ½-mile in order to avoid a center bridge pier. All southbound lanes will rejoin south of Lincoln Avenue.

To date, the project has recycled nearly all of the old asphalt and concrete removed as part of the project. Interstate Highway Construction has milled and processed approximately 34,500 tons of asphalt and crushed over 14,000 tons of concrete for placement back into the project. Through these and other innovations, the contractor has reduced the project schedule by five months.

The I-25 Widening Project will add an additional lane in each direction on I-25 from Lincoln Avenue to County Line Road, resulting in four lanes in each direction south of the C-470 / E-470 interchange. In addition to expanding capacity on I-25, crews will replace existing asphalt with concrete to better match the I-25 corridor. This project will improve the traffic patterns from and to all affected ramps as well as provide new pedestrian connections. Funded by CDOT, Douglas County, City of Lone Tree and the Denver Regional Council of Governments (DRCOG), this $32 million project is intended to be substantially complete by the end of 2015.

Updated information regarding this project is available by calling the project hotline (303) 358-7643 or visiting the website at For information on other projects, visit, call 511 or download CDOT mobile.