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Daytime Work Begins in I-25 Median Between Monument & Castle Rock

Oct. 3, 2018 - I-25 South Gap Project Crews to Start Widening Shoulders for Express Lanes


DOUGLAS COUNTY—Drivers on I-25 between Monument and Castle Rock will notice more construction this month as I-25 South Gap crews begin working in the median to build wider shoulders and the new Express Lanes.

Work this Week

This week, crews will prepare to remove asphalt inside the median near Castle Rock, between Plum Creek Parkway and Sky View Lane (Tomah Road). By next week, crews will mobilize heavy equipment, and trucks will be entering and exiting the median frequently.

Work has been occurring throughout the 18-mile corridor since the August 2018 groundbreaking, but the most active construction is just south of Castle Rock between Plum Creek Parkway and Sky View Lane. The new Express Lanes and wider shoulders will be built in the median along that five-mile stretch.

Travel Impacts

  • Closures are planned from 9 a.m. to 4 p.m. Mondays through Fridays and from 8:30 p.m. to 5 a.m. Sundays through Thursdays.
  • While work in the median will not require lane closures, from 8:30 p.m. to 5 a.m. Sundays through Thursdays, drivers should continue to expect intermittent lane closures on I-25.
  • Work along the east and west frontage roads will continue with daytime and overnight closures throughout the 18-mile corridor for drainage work and fiber optic installation.
  • Watch for trucks and construction equipment.
  • Please obey all posted speed limits and do not follow trucks into the work zone.
  • Please watch for flaggers, who will maintain home and business access.

Project Info

CDOT is improving 18 miles of I-25 from south of Castle Rock to Monument by widening the road from two to three lanes in each direction. The new lane will operate as an Express Lane, allowing motorists the choice of taking the Express Lane for a faster and more reliable travel time in exchange for a toll, or driving the general-purpose lanes for free. Carpools with three or more people will be able to ride the Express Lane for free.

Other improvements include widening the shoulders, rebuilding bridges, building new wildlife crossings, resurfacing with new pavement and modernizing technology.

The cost of the project is $350 million. Substantial completion of the project is expected late 2021, with Express Lanes opening in 2022.

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