Highway N is on the verge of a major makeover in St. Charles County, where officials are pressing ahead with a multi-phase plan to widen roughly four miles of the busy corridor. The project would add lanes and build connector roads to keep up with planned housing growth, with a tentative 2027 groundbreaking and a goal of wrapping up Phase One by 2029 if funding falls into place.
What The County Is Proposing
Under the current plan, Phase One would widen Highway N to three lanes in each direction, six lanes total, between Hawk Ridge Trail and Sommers Road. East of Sommers, it would scale back to two lanes each way from Sommers Road past Perry Cate Boulevard to Ebert Lane. All told, Phase One would upgrade about four miles of the corridor, according to St. Charles County.
Design Work And Right-of-way Already Under Way
County transportation planners say they have been quietly doing the unglamorous prep work so the project is ready to go once the money is lined up. "We've been buying right-of-way along the route and doing environment and design work," Amanda Brauer, the county's managing director of transportation planning, wrote in a Facebook post the county published on Tuesday, according to St. Charles County - Government. The post describes the effort as a two-phase approach meant to time construction with growth in the area.
Price Tag And Funding
Phase One's price tag is estimated at $80 to $100 million, and county leaders say they will pull together a mix of federal, state, and local funding to cover it. The county has already set aside more than $46 million in local Transportation Sales Tax money for Highway N improvements, and officials say they hope to have Phase One fully funded by June so construction can start as early as 2027 and finish by 2029, according to St. Charles County.
Growth Driving The Change
Planners argue the widening is a direct response to development pressure along the corridor. Neighborhood plats for more than 1,700 homes have already been drawn in the area, and the recently completed Duckett Creek sewage plant has made construction there more feasible. County Planning and Zoning Director Robert Myers told county officials he expects those homes to be built over the next five to ten years, placing additional strain on the existing two-lane stretches, according to the county's Facebook update. Local officials say the project is meant to keep traffic flowing as the area fills in, rather than waiting until congestion becomes chronic.
What Neighbors Should Watch For
Residents along Highway N can expect outreach about potential property acquisitions, public meetings on final alignments, and a construction schedule that rolls out in phases over several years. Officials say they will coordinate timelines with affected municipalities and chase federal and state grants while continuing to use local Transportation Sales Tax funds to push the work forward.
