The Connecticut Department of Transportation (CTDOT) plans to rebuild 3.7 miles of Route 25 in Trumbull and cut the number of lanes in both directions, with construction expected to start in fall 2030. The department's Nov. 9 notice does not say how many lanes would remain, what the work will cost or when residents can comment at a public meeting.
The road carries a lot of traffic. CTDOT's 2018 traffic log lists 37,800 vehicles a day for the stretch from the Park Street exit to Route 111. The department's count station labeled "Route 25 - 9.57 mi South of Route 111" logged an annualized average of 30,300 a day in July 2021, and the station labeled "Route 25 - 9.89 mi NW of Route 111" logged 22,300 in late September 2025. The notice does not say whether either station lies inside the project. Earlier counts at the first station, from 2007 to 2016, range from 19,100 to 38,800, so each figure is a rough guide rather than a forecast.
What the notice describes
The work runs from the Route 111 intersection to the overpass of the Twin Brooks Pequonnock Trail. It includes full-depth reconstruction of the roadway, milling and overlaying on all ramps at Exit 6, and roadside safety improvements. If ramps must close, the notice says short, off-peak detours will be used.
Why lanes would go
CTDOT gives one reason: the lane reduction is "aimed at reducing the directly connected impervious area," or DCIA. The notice does not define the term. The state environmental agency's current general permit for CTDOT's storm drains, issued June 23, 2025, does: a paved or other hard surface whose runoff goes straight to a waterway, or into a storm sewer that leads to one. The permit sets cumulative goals, counted from July 1, 2014, for CTDOT to complete retrofits or reconstruction that reduce 40 acres of that area by June 30, 2027 and 80 acres by June 30, 2030.
The notice does not say whether Route 25 is part of that effort, how much pavement would be removed or which stretches would lose lanes. It also offers no traffic analysis, the other thing a driver would need to judge the change.
Timeline and money
CTDOT says design should be finished in summer 2030 and construction should start that fall, depending on project acceptance, funding and any right-of-way and environmental permits. The project is 80 percent federally funded and 20 percent state funded. No total cost is given.
Questions go to Principal Engineer Sebastian A. Cannamela at (860) 594-2698 or Sebastian.Cannamela@ct.gov, referencing State Project No. 0144-0202. The notice announces no public meeting and no comment deadline.
