United States – Lake Mead Tunnel
In 2008, Impregilo won the competitive bidding launched by the Southern Nevada Water Authority (SNWA) for the construction of an articulated collection and transport system for the water of Lake Mead, one of the largest manmade lakes in the United States, in order to increase the supply of water for drinking and household use in the Las Vegas metropolitan area. The value of the contract is $447 million.
The percentage of work completion as of March 31, 2014 was 74.8%.
United States – San Francisco Metro
At the end of the first half of 2011, the Board of Directors of the San Francisco Municipal Transportation Agency awarded a contract to the Impregilo Group (in a consortium with the American company Barnard) for construction of the "Central Subway" metro line extension in the city of San Francisco. The overall value of the contract is US $233 million; Impregilo, through its subsidiary SA Healy, has a total stake of 45%. The project involves an underground extension of the current surface line in the city's downtown area, with construction of two new single-track tunnels having a total length of 5 km, which will be made with two 6.4 m diameter TBMs. The expected duration of the work is 35 months.
The percentage of work completion as of March 31, 2014 was 77.7%.
United States – Anacostia River Tunnel
On May 8, 2013, the Impregilo Group, in partnership with Parsons Corporation, a leading construction company in the United States, won the competitive bidding to design and build a section of the waste water collection and treatment system of the city of Washington DC. The high-tech project is valued at approximately $254 million (the Group's overall share is 65%). Impregilo will be the leader of the project, which is expected to be completed in about 4 1/2 years once work starts.
The "Anacostia River Tunnel" project is part of DC Waters' "Clean Rivers Project." It calls for the construction of a water tunnel running largely beneath the Anacostia, a tributary of the Potomac River. The tunnel will be about 3.8 km long and 7 m in inside diameter; there are also plans for the construction of 6 water uptake wells to a depth of about 30 m. The tunnel will carry wastewater and stormwater separately to prevent river pollution during floods (Combined Sewer Overflows or "CSO") that occur in periods of heavy rainfall.
The percentage of work completion as of March 31, 2014 was 5.2%.