Douglas County adds eastbound lane closure on County Line Road
Eastbound County Line Road will lose its right lane from Broadway to Phillips Street for about two months, adding new delays near Highlands Ranch businesses and Phillips Avenue.
A new eastbound right-lane closure on County Line Road from Broadway to Phillips Street begins Monday, June 29, and lasts about two months. Sidewalk work continues near Wilmore Nursery on Phillips Avenue, where pedestrians are being detoured to the west side of the street while the east-side sidewalk stays closed.
The widening and reconstruction project between University Boulevard and Broadway has already shifted eastbound and westbound traffic north between Clarkson Street and University Boulevard, leaving one lane open in each direction. That has changed access for businesses in the work zone, including properties near U-Haul Storage and Circle K, where drivers can now reach businesses only from eastbound County Line Road during this phase.
Douglas County says the corridor carries about 25,000 road users each day. The project began in September 2025 and is expected to take about 24 months, with a planning estimate of about $30 million. It will add one travel lane in each direction, install a new traffic signal at Clarkson Street and County Line Road, add sidewalks, and include a mill-and-overlay section between Phillips Avenue and Broadway in Littleton. Planning and development have been underway since 2019, including final design, right-of-way acquisition and utility relocation work for a major water line.
The corridor reopened on April 16 after a 100-day closure between University Boulevard and Broadway, during which crews placed 30,000 cubic yards of dirt, replaced 1,500 feet of Denver Water pipe, built more than 3,000 feet of concrete wall and installed 3,000 feet of concrete storm pipe. By then, work had also started on one of two water quality ponds. A planned full closure later in the project will help move dirt at Lee Gulch.
Wilmore Nursery and Garden Center assistant manager Makayla Vincent said the earlier closure hurt customers and deliveries by cutting traffic. Project manager Ben Pierce said the nursery appreciated the reopening and asked drivers to slow down because lane widening and finishing work were still underway. At the Sept. 12, 2025 groundbreaking, Commissioner Kevin Van Winkle said the effort required collaboration among the Denver Regional Council of Governments, Douglas County, the City of Centennial and the City of Littleton, while Commissioner Abe Laydon called County Line Road a “shared lifeline” for families, workers, businesses and first responders. Douglas County says project completion is slated for September 2027.
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