It happened at 12:30 a.m. Monday.
Officials say the 34-year-old paramedic was trying to jump across the divide between the northbound and southbound sides of the Route 7 bridge when he fell.
He plunged 50 feet onto the creek bed below. He was taken to the hospital with neck and back injuries.
The paramedic was part of the a team responding to two separate accidents Delaware Park Boulevard and North Main Street.
In the first, a 25-year-old man and a 23-year-old woman were hurt in a single vehicle rollover crash.
The man was treated for neck and back injuries. The woman was treated for head injuries. Both victims were transported to Christiana Hospital in stable condition.
In the second, crews had to use the "Jaws of Life" to free a driver trapped for over 30 minutes in a multi-vehicle crash.
A 60-year-old man was treated for back and internal injuries and transported to the Christiana Hospital in stable condition