An 18 metre bridge has been installed at the site in Otterspool, Liverpool, where the International Garden Festival took place in 1984.
The site is set to re-open in spring this year after work to restore the site began in February 2010.
Park owner The Land Trust has appointed environmental charity Groundwork Merseyside to manage the project, which is being funded by a £3.7m grant from the North West Development Agency.
Work includes reinstating ten lakes, the Japanese garden and Chinese pagodas in 20 acres of the 60-acre site.
The bridge took five months to build and provides pedestrian, disabled and cycle access to the promenade via a shared surface pathway and links a "bio-diversity zone" to the oriental gardens. An 80 tonne crane was used to install the bridge.
The project saw landscape designer Professor Masao Fukuhara travel to Liverpool to assist the restoration process. Fukuhara, who is a leading academic on the design of ornamental Japanese Gardens, originally worked on the site when the garden was created almost 27 years ago.
Plans for residential development on the brownfield part of the site to the north of the park were put on hold by developer Langtree until the market returns.
John Downes, managing director of landowner Langtree, said: "The site has undergone a remarkable transformation since the restoration began last year.
"With the help of Liverpool City Council, the North West Development Agency, The Land Trust and the local community, we are creating a park and new residential community that will deliver long term sustainability and provide a major gateway to the city."