I-25 and Fillmore Street Interchange


Construction on the Interstate 25 and Fillmore Street Interchange project in Colorado Springs is progressing as crews work to complete work on the new Diverging Diamond Interchange (DDI). The project will convert the existing interchange into a DDI configuration, the second along the Front Range and the third in Colorado. The new interchange will provide a more efficient traffic flow by allowing for continuous transition on and off the highway, increasing traffic capacity and reducing conflict points at intersections.  Additionally, larger pedestrian walkways and bike paths will improve safety through the corridor. 

traffic movement through DDI alignment
Traffic move through the new DDI alignment

Project Progress

The project is approximately 80 percent complete and on schedule to be complete by summer 2016.   

Motorists will experience a new traffic pattern across the interchange, now that the DDI alignment has been installed. All new bridge structure work was completed in March, which allowed for crews to demolish old bridge structures still remaining. Upcoming work will include replacement of 5 inches of asphalt on the west and east Intersections, which will be completed over one weekend. The installation of pedestrian guardrail, permanent median drainage, as well as curb and gutter placement and striping are also forthcoming. 

Schedule and Traffic Impacts

Normal working hours are from Monday through Friday from 7 a.m. to 5 p.m. There will be some nighttime and weekend work as needed.

Beginning Friday, April 22, at 8 p.m., and lasting through Monday, April 25, at 5 a.m., a full closure of Fillmore Street from Chestnut Street to Mark Dabling Boulevard will be in place. Additionally, all I-25 on-and off-ramps at Fillmore Street will be closed during this time. During this closure, crews replace 5-inches of asphalt, install median drainage, and apply striping.

There will be signed detours along I-25 to direct motorists around the work. Motorists can utilize northbound Centennial Boulevard or I-25 to Garden of the Gods Road to access Mark Dabling Boulevard south to continue eastbound on Fillmore Street. Fontanero Street to northbound Chestnut will detour motorists around the closure to access westbound Fillmore Street.

On Monday, April 25, through Thursday, April 28, there will be intermittent double lane closures on northbound and southbound I-25 from 9 p.m. to 5 a.m. while crews remove overhang brackets and apply striping. 

Drivers are encouraged to use caution on Fillmore Street as the traffic pattern will be significantly different across the bridge. When driving a DDI, motorists will proceed through the first traffic signal and follow their lane to the opposite side of the roadway. Drivers needing to access I-25 from Fillmore Street will have access to the on-ramp from the left lane, without having to stop or wait for oncoming traffic. Through traffic will proceed in their designated lanes past the second traffic signal as the lanes shift back to the right side of the road.

The speed limit is reduced in the construction zone to 55 mph on I-25 and 35 mph on Fillmore Street for both the safety of the traveling public as well as construction crews working along the highway.

Business access will be maintained.

Pedestrians are advised to use caution while utilizing the new walkway. Signing and striping will indicate pedestrian routes and will change with the phasing of the project.

Please use caution and stay alert while traveling through the construction zone. Follow flaggers’ directions and reduced posted speed limits.

About the DDI

The Diverging Diamond Interchange transitions traffic from one side of the road to the opposite side. This innovative interchange will improve safety and traffic flow through the corridor to meet existing and future travel demands.

As part of this project, two new bridges will be constructed to replace the current bridge structure, which was built in 1960 and widened in the 1970s. Each bridge will be approximately 220 feet long, with a 14-foot-wide sidewalk on the eastbound side for pedestrian use. There also will be 5-foot-wide bicycle lanes eastbound and westbound on both bridges. In addition, the southbound off-ramp and northbound

on-ramp for I-25 will be lengthened to accommodate the amount of traffic utilizing this route.

For more information visit:

DDI Fillmore March 2016

Colorado: The Official State Web Portal