A stretch of Grey Road 40 will be closed near Thornbury starting today, as crews work to complete two emergency culvert replacements.
Grey County says the stretch of road between Grey Road 7 and 13 in Grey Highlands will be closed for approximately five weeks.
According to the county, two culverts were significantly damaged during a major summer storm in 2025. Temporary repairs were completed at that time but continued heavy rainfall and spring runoff have further eroded the embankment and weakened the structures.
Grey County's Engineering Manager Trevor Ireton said if one culvert is not replaced, there is a risk of failure. To prevent repeat disruption, the County will replace both culverts as part of a single project, which is estimated to cost approximately $700,000.
Local road access will be maintained from both ends of the closure.
Detour routes will be marked with signs and can also be found at the County's website.
Grey County says it recognizes the detour will be inconvenient for many travelers and encourages residents and visitors to plan ahead and adjust their routes.
