Extended closure of the County Line Road Interchange begins Sunday

Travel Advisory

June 24, 2021 - Central/Eastern Colorado/Southeastern Colorado - On-ramp closing tonight, in advance of full interchange closure

DOUGLAS/EL PASO COUNTIES – The Interstate 25/County Line Road Interchange (Exit 163) near Monument is closing for several days, allowing crews to connect the new ramps and bridge structure to the current roadway.

Traffic Impacts 

(schedule is weather-dependent and subject to change)

  • CLOSING OVERNIGHT: County Line Road on-ramp to southbound I-25, Thursday, June 24. REOPENING by Friday, July 2, at 5 a.m.
  • County Line Road over I-25 and the remaining I-25 on- and off-ramps CLOSED at 10 p.m. Sunday, June 27. REOPENING by Friday, July 2, at 5 a.m.
  • Detour for local traffic and access to I-25 is the Highway 105 Interchange in Monument – Exit 161

Following the closure, traffic will switch to the newly constructed bridge segment. Work then begins to demolish and build the middle section. For the remainder of construction, drivers generally will have access across the bridge, though some overnight closures will be necessary for demolition.

County Line Road Closure Map

About the County Line Road Bridge

The County Line Road bridge (circa 1964) is one of five bridges being replaced as part of the 18-mile I-25 South Gap project between Monument and Castle Rock. By the end of 2021, the reconstructed bridge will have wider shoulders, one through-lane and a turn-lane in each direction.

County Line road Bridge Construction Phases

Project Info

Project Hotline: 720-745-5434

Web: i25gap.codot.gov

Sign up for email updates: [email protected]

Text alerts: Text I25GAP to 21000

Project Facebook Page: Facebook.com/I25SouthGapProject

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, allowing motorists the choice of taking the Express Lane for a faster, more reliable travel time in exchange for a toll. Express Lanes 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 $419.5 million project, scheduled for completion in November 2022, also includes shoulder widening, rebuilding bridges, new wildlife crossings, resurfacing with new pavement and modernizing technology.

Remember: Slow for the Cone Zone

The following tips are to help you stay safe while traveling through maintenance and construction work zones.

  • Do not speed in work zones. Obey the posted speed limits.
  • Stay Alert! Expect the unexpected.
  • Watch for workers. Drive with caution.
  • Anticipate lane shifts and merge when directed to do so
  • Expect delays, especially during peak travel times.
  • Allow ample space between you and the car in front of you.
  • Avoid using mobile devices such as phones while driving in work zones.
  • Turn on headlights so that workers and other drivers can see you.
  • Be especially alert at night while driving in work zones.
  • Be patient!