For those who use County Line Road to commute to and from work or live in a neighborhood along the road, expect to use alternative routes as a portion of the road will be closed for nearly 100 days.
County Line Road is the road that separates Douglas and Arapahoe counties. Averaging about 25,000 road users daily, according to Douglas County, it is a major arterial road for businesses, commuters and residents in Highlands Ranch, the City of Littleton and the City of Centennial.
In September 2025, Douglas County, along with the City of Littleton, the City of Centennial and the Denver Regional Council of Governments, announced the County Line Road Reconstruction and Widening Project…