Amey has been awarded a contract to manage two major river crossings in the East of Scotland.
The deal, worth £60m over five years, will begin in June 2015 with the option to extend up to five years.
It will manage and maintain the original structur as well as the new bridge when it opens in December 2016.
Amey will manage the river crossings as well as the associated approach roads.
Its services will include engineering design, supporting local employment, routine and winter maintenance, incident response to improve network reliability and journey times, business, leisure and tourism.
The contractor is now managing every available Forth River vehicle crossing, as it already oversees the Clackmannanshire and Kincardine bridges.
Amey also holds an examinations contract with Network Rail, where they inspect and report on the asset condition of the Forth Rail Bridge.
Amey chief executive Mel Ewell said: “By using our asset management and engineering expertise we will ensure these iconic structures continue to play a pivotal role in Scotland’s road network and help keep Scotland moving.”
Transport minister Derek Mackay said: “Amey’s own strong commitment to engineering skills, staff training, and employee retention, all part of its integrated business model, was identified as significant during the tender process.
Mr Mackay added that under contract requirements, Amey will be committed to SMEs and to providing training and employment opportunities.
Educational and charitable contributions are also included, such as supporting two work clubs and running visits to the bridges.
The Queensferry crossing, which will run alongside the Forth Road Bridge from Edinburgh to Fife, will have two lanes and a hard shoulder in each direction.
It will also include new wind shielding to allow the bridge to stay open during high winds.
Amey is a part of the M8 M73 M74 DBFO that will complete Scotland’s central motorway system.
This latest deal means they have two of the five management and maintenance contracts available: the South East Unit and the Forth Bridges Unit.