A dive team with Los Angeles Port Police pulled the body from the murky water several hours later, Nordquist said. Scott's body was taken to a dock in Wilmington and turned over to the county coroner's office.
One lane of the eastbound side of the bridge was closed to traffic during the investigation. Cargo vessels moved at reduced speeds through the east side of the port's main channel during the search, said Los Angeles Fire Department spokesman Brian Humphrey.
Investigators found a note in Scott's car, which was parked on the bridge, according to the Los Angeles Times. That note listed contact information. A suicide note was later found at his office.
The British-born Scott, who lived in Beverly Hills, was producer and director Ridley Scott's brother.
The two brothers ran Scott Free Productions and were working jointly on a film called "Killing Lincoln," based on the best seller by Bill O'Reilly. Their company produced a 2011 documentary about the Battle of Gettysburg for the History Channel. Ridley Scott's "Prometheus" was a summer blockbuster.
"Top Gun," starring Tom Cruise, was one of the highest-grossing films of 1986. The pair worked together again four years later on the hit "Days of Thunder."
Scott frequently worked with Denzel Washington, most recently on the runaway train drama "Unstoppable." Scott and Washington collaborated on three other films: "Man on Fire," Deja Vu," and "The Taking of Pelham 123."
In a tweet Sunday, Director Ron Howard said, "No more Tony Scott movies. Tragic day."
Other Scott films include "True Romance," "Crimson Tide" and "Enemy of the State."
Scott was married to actress Donna Scott. They have twin sons.