Washington Group International, Inc. was formed in July 2000 following the acquisition by Morrison Knudsen Corporation of Raytheon Engineers & Constructors. The combined company moved forward with a new name and a position as one of the largest engineering and construction firms in the United States.

Washington Group has approximately 38,000 employees at work in more than 40 countries around the world. The company is headquartered in Boise, Idaho, and is organized into five operating units: Power, Infrastructure & Mining, Government, Industrial/Process, and Petroleum & Chemicals.

The company provides engineering, construction, and program-management services to the environmental, government, heavy-civil, industrial, mining, nuclear-services, operations and maintenance, power, process, transportation, and water-resources markets.

Many of the most historic projects of the last 100 years are part of the company's legacy. These include the Hoover Dam, the San Francisco Bay Bridge, the Trans-Alaska Pipeline, and major features of the Kennedy Space Center.