Crew relocate utility lines as part of a project to replace Seattle's Alaskan Way Viaduct, a double-decker elevated highway, with a tunnel. The project had a controversial history but is now making progress, with boring of the tunnel expected to start next year. Photo: Washington State Department of Transportation
1 of 10

The 10 Biggest Infrastructure Projects

The five biggest projects in the country right now -- and the five biggest ones in jeopardy.