OPP probing overnight collision involving four vehicles
Five people were taken to hospital with serious, non-life-threatening injuries after a multi-vehicle collision on Highway 406 in St. Catharines early Monday. Ontario Provincial Police say the crash, which involved four vehicles, happened shortly before 2 a.m. on July 20, 2026.
“Ontario Provincial Police (OPP) are investigating a multi-vehicle crash in St. Catharines that sent five people to the hospital with serious, non-life-threatening injuries.”
In the hours that followed, lanes on Highway 406 between Westchester Crescent and Glendale Avenue, along with the on-ramp to the highway, were closed to traffic to allow first responders to treat the injured and for investigators to document the scene. OPP reported the affected stretch reopened at about 6:10 a.m.
Closures lifted before the morning rush
The closure affected one of Niagara’s main north–south corridors used by commuters, hospital staff, students and commercial drivers. While the full cause remains under investigation, reopening the roadway before sunrise reduced further disruption to the Monday morning drive through central St. Catharines and the south Niagara approach to the Queen Elizabeth Way.
Police have not released details about the circumstances leading up to the collision or the nature of the injuries beyond their current assessment. No updates on potential charges or contributing factors were available as of publication.
What we know so far
- Time of crash: just before 2 a.m. Monday, July 20, 2026
- Location: Highway 406, between Westchester Crescent and Glendale Avenue, including the Highway 406 on-ramp
- Involved vehicles: four
- People injured: five, all transported to hospital with serious, non-life-threatening injuries
- Status: lanes and ramp reopened around 6:10 a.m.
Timeline of the response
| Event | Time |
|---|---|
| Collision reported | Just before 2:00 a.m. |
| Lane and on-ramp closures implemented | Overnight (following the crash) |
| Highway section reopens | ~6:10 a.m. |
Investigation continues
OPP investigators are working to determine how the four vehicles came into contact on the controlled-access highway and whether speed, impairment, weather, visibility or other roadway conditions were factors. Police had not provided additional findings or updates on the extent of individual injuries at the time of writing.
Multi-vehicle collisions on limited-access routes such as Highway 406 typically require extended closures to allow paramedics, firefighters and police to operate safely and to ensure evidence can be documented before vehicles are cleared. The stretch between Westchester and Glendale serves as a connection for neighbourhoods, commercial areas and access points to major routes through Niagara, which can amplify the impact of any shutdown.
What drivers can expect next
With lanes back in service, motorists using Highway 406 through St. Catharines should not encounter residual closures from this incident. As with any collision under active investigation, authorities may return to the area for follow-up work, but no further traffic restrictions were announced by the OPP.
Police have not released any names related to the crash. Anyone who was travelling through the area overnight and has dashcam footage or information that could assist investigators is encouraged to contact the Ontario Provincial Police.
