The structure over the A565 Great Howard Street was built by Graham Construction as part of a wider £100m infrastructure programme along the city's Atlantic Corridor to help regenerate north Liverpool.
With one lane of the dual carriageway opening at the weekend, the remaining lane and pavements will remain closed to allow for work to be completed on footpaths and the installation of utilities.
The 2.7km route is seen as crucial to a new creative district in the area - called Ten Streets - and will have other benefits for Everton FC's proposed new stadium at nearby Bramley Moore Dock.
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The new dual carriageway, part funded by the Liverpool City Region Growth Deal, will also pave the way for a major revamp of the historic Regent Road – aka "the Dock Road” – to make that more pedestrian and bike friendly, creating a continuous cycle route from Crosby to Liverpool.
Deputy Mayor, Cllr Ann O'Byrne, said: "We would like to thank motorists and local residents for their patience while this work has been carried out.
"It has been a challenging engineering project due to the age of the structure and the condition of the foundations, but what we have now is a new bridge which will carry thousands of vehicles over it every day for many decades to come.
"This is a really crucial route in and out of the city, which is why we are investing significantly to make sure it is able to carry freight and cars.
"This is especially important on this route due to the completion of the new Liverpool 2 deep water port which is absolutely critical to the future economic success of the city region and will help create and support many jobs."
(LM)
