Niagara Regional Police responded to the Central Avenue QEW Overpass for a report of a person in distress.
Officers got there just before 11:00 a.m. on Saturday.
Shortly after police arrived, the 28-year-old man fell from the bridge and was taken to an out-of-town hospital with serious but non life threatening injuries.
The Special Investigation Unit has started an investigation into the situation.

Province Investing Against Invasive Species
Niagara Driver Charged with Drug Impairment
Welland Man Arrested for Child Porn
28 More Doctors Hired in Niagara
Killed Police Officers Honoured by NRP
Niagara Wineries Shuttle Service Possible
Canal Days Vendors Warned of Scams
Niagara Falls Exploring Hub to Help Homeless