The trestle bridge will be used by heavy construction vehicles and sophisticated equipment purely as an access platform to the build site.
A lifting section, which will be used to allow boats to pass up and down the river, is also due to be installed.
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The consortium is made up of three contractors, FCC Construcción, Kier Infrastructure & Overseas and Samsung Construction & Trading.
The temporary bridge will be dismantled and removed completely when the new Mersey Gateway Bridge is in place.
Richard Walker, Merserylink Project Director, said: "Completion of the trestle bridge marks another important milestone for the Mersey Gateway Project.
"It will provide us with full access to the river, enabling work to start on the central cofferdam.
"This is a great achievement for the project and I’d like to thank everyone involved for their hard work."
(LM)
