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Colorado DOT Marks One Year of Construction on I-25 South Gap

DENVER, CO — The Colorado Department of Transportation (CDOT) recently celebrated the one-year anniversary of the Interstate 25 South Gap project, designed and constructed to improve safety and travel reliability between Monument and Castle Rock.

As part of its Whole System – Whole Safety program, CDOT is adding a new express lane in each direction, widening shoulders, building four new wildlife crossings, reconstructing four aging bridges and improving the pavement throughout the 18-mile segment, the longest work zone in Colorado.

As part of marking the project’s first year of construction, CDOT is adding funds to replace the County Line Road bridge between El Paso and Douglas counties and to add a truck climbing lane in the southbound direction from Greenland Road to the Truck Weigh Station in Monument.

“At CDOT, our goal is to get everyone home safely,” said CDOT Executive Director Shoshana Lew. “Every day our crews are working hard to improve our infrastructure through massive construction projects. We are excited and proud to be recognizing this milestone on the I-25 South Gap project with additional funding for the climbing lane and for another bridge replacement.”

Milestones from Year One

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From September 2018 to August 2019, crews have accomplished the following:

• Along the entire 18 miles, crews have installed 10 of 12 total miles of new fiber optic line.
• Near Castle Rock, crews have installed more than three miles of permanent pavement.
• In excess of 60,000 tons of asphalt have been installed thus far (more than 800,000 tons of asphalt will be laid project-wide).
• More than 16,000 linear feet of new pipe have been installed (nearly 45,500 linear feet will be installed).
• At Greenland Road, crews have shifted traffic to demolish the single lane box culvert and rebuild the interchange into a two-lane underpass. Drivers are now traveling on some permanent pavement in the area.
• Crews have begun constructing three wildlife crossings near Monument. Work has included girder sets, deck pours and earth retaining walls. Nearly 6,000 linear feet of bridge beam will be set in this area by fall.
• A sound wall is nearly complete along southbound I-25 near the Monument Truck Weigh Station.
• More than 163,300 linear feet of concrete barrier has been installed (crews will work behind more than 250,000 linear feet of concrete barrier when it is fully installed).

I25 MyWay – Better Commuting Options

The I-25 South Gap project has partnered with the Denver Regional Council of Governments to provide commuting options to those driving through the I-25 South Gap. People who have chosen to commute have helped reduce the drive-alone rate, which reduces congestion in the construction zone. Commuters have also improved overall air quality, saved money, reduced stress and taken back their time when not behind the wheel due to the I25 MyWay program. For more information on commuting options, visit

As of July 31, 2019:

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• 2,313 riders on new Bustang Denver Technological Center route (began December 17, 2018)
• 977 cars off the road in just 159 days since launch of Bustang DTC Line
• 402 vanpool riders resulting in 341 cars off the road
• 126 free roundtrips provided for use on the South Line to Union Station or the route to the DTC
• 1,401 cars off the road every workday due to vanpools, Bustang and other commuting options through the I-25 South Gap

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, which 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, scheduled for completion in 2022, also includes new and improved signing and striping, and modernizing technology.

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Your local Trimble Construction Division dealer
SITECH Northwest
SITECH Rocky Mountain
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