Major construction projects in downtown Chatham, Ontario, will modernize aging watermains and roads across the 2025–2026 construction season, with major activity peaking in 2026. The Municipality of Chatham-Kent is leading several high-impact works, including a full reconstruction of King Street West and shoreline stabilization on Thames Street to guard against erosion and flood damage.
The King Street West reconstruction will span from Lacroix Street to Second Street and is tentatively scheduled to take place between June 2026 and November 2026, the municipality says. The project includes replacement of aging watermains (in places more than 50 years old) and traffic-signal replacement/upgrade work at the Lacroix Street intersection. Municipal materials describe the work as a full road rebuild with watermain replacement and sewer separation.
Other key projects include sewer separation work on Cox and Faircourt Avenues to replace combined sewers (which carry both stormwater and sanitary flows) with separate storm and sanitary lines — a measure intended to reduce basement flooding. The Thames Street project is a slope and shoreline stabilization program designed to protect the downtown riverfront from erosion and flood risk; municipal documents schedule Thames Street work to begin in Fall 2025 and run into winter 2026.
While the construction will cause temporary disruptions — including road closures and the potential for short-term water service interruptions during tie-ins — municipal planners say the underground upgrades are needed to support the Imagine Chatham-Kent downtown redevelopment. Officials say improving distribution and sanitary capacity will help accommodate higher-density housing and the planned transformation of the former Downtown Chatham Centre into a community hub.
