Balfour Beatty subsidiaries have also won a rail maintenance contract in California.
The wastewater tunnel project, for the Narragansett Bay commission in Providence, Rhode Island, will be completed in a joint venture with Balfour Beatty’s established US tunnelling partner ML Shank.
Subsidiaries Marta Track Constructors and Metroplex Corporation have been awarded five-year contracts by the Alameda Corridor Transportation Authority to maintain the new Alameda corridor rail link in California.
The contract covers track, signals, telecoms, structures, pumping stations and emergency response.
Balfour Beatty’s Texan road contracts are in Houston for the Harris County Toll Road Authority and Desoto, south of Dallas, for the Texas Department of Transportation.
Balfour Beatty is bidding for a third Texan contract as part of a joint venture estimated to be worth £800m.
Chief executive Mike Welton said the new work brings Balfour’s total US order book to almost £800m.
He said: “We are now a leading player in the growing US markets for civil and rail engineering.”