Forty-three people were killed when part of the bridge, and cars travelling along it, fell 45m last August.
Access to Genoa's busy port has been more hard since the bridge collapsed, which has also caused a lengthy detour for drivers wanting to head to southern France.
The remnants of a bridge in Italy that collapsed last summer, killing 43 people, were finally torn down as a planned explosion cleared the structure in Genoa on Friday morning.
The remains of the Morandi bridge are to be detonated at 9am, with almost 4,000 local residents evacuated, the city authorities said.
Debris and rubble at the site after the explosive charges were set off to bring down Genoa's Morandi motorway bridge.
Genoa Mayor Marco Bucci said the controlled demolition had gone to plan, after a short delay to check on a report that someone might have been holed up in an abandoned apartment block nearby.
The controlled explosion used 550 kilograms of explosives to destroy the two towers of the Morandi bridge.
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Almost 4,000 residents had been evacuated ahead of the demolition, and water tanks were placed around the towers to prevent the spread of dust.
Italy's Deputy Prime Ministers Matteo Salvini and Luigi Di Maio are expected to attend. Salvini said the operation marked the start of the reconstruction. (Antonio Calanni/AP Photo) Controlled explosions demolish two of the pylons of the Morandi bridge nearly one year since a section of the viaduct collapsed killing 43 people, in Genoa, Italy on June 28, 2019.
World-famed architect Renzo Piano, a Genoa native, has designed a replacement bridge that will feature 43 lamps dotting the span in tribute to those who lost their lives.
Italian companies Salini Impregilo and Fincantieri have been assigned the role of reconstructing the bridge.
Meanwhile, controversy persists over concessions enjoyed by Italian infrastructure group Atlantia, whose majority-owned subsidiary Autostrade was responsible for maintenance works on the bridge.
Autostrade has denied wrongdoing, saying regular, state-supervised inspections had indicated the ageing viaduct was safe.