Date Price (nominal) Reference Year Price (ref. year) Price (2016 $) Project 1992 -- 2006 $14.6 billion 1982 $8.08 billion $20.1 billion Big Dig, Boston, Massachusetts 2002 -- 2013 $6.416 billion (est.) San Francisco -- Oakland Bay Bridge East Span Replacement, San Francisco / Oakland, California 1988 -- 2002 $5.0 billion Mon -- Fayette Expressway, southwest Pennsylvania and northern West Virginia 2005 -- 2020 (est.) $4.1 billion (est.) Ohio River Bridges Project, Louisville, Kentucky, and southern Indiana 2001 -- 2007 $3.6 billion Central Texas Turnpike, area around Austin, Texas 2007 -- 2011 $2.57 billion Intercounty Connector, Montgomery County, Maryland 1999 -- 2008 $2.5 billion Woodrow Wilson Bridge Replacement, Washington, D.C., Northern Virginia, and southern Maryland 2015 -- 2021 $2.3 billion (est.) I - 4 Ultimate corridor reconstruction, Orlando, Florida 2012 -- 2015 $4.25 billion Alaskan Way Viaduct replacement tunnel, Seattle, Washington 2008 -- 2018 $1.8 billion (est.) Interstate 69 Extension SIU # 3, Evansville to Indianapolis, Indiana 2013 -- 2021 $1.6 billion (est.) Wekiva Parkway, Orlando, Florida 2001 -- 2016 $1.4 billion (est.) I - 95 New Haven Harbor Corridor Reconstruction, New Haven, Connecticut 1991 -- 2003 $1.2 billion E-470, Denver, Colorado 1933 -- 2007 $37 million 1937 $37 million $616 million Golden Gate Bridge 2015 -- 2028 $67.6 billion (est.) 2013 $54.9 billion $56.4 billion (est.) California High - Speed Rail, Phase 1, California 1863 -- 1869 $124,548,691 1873 $124,548,691 $2.49 billion First Transcontinental Railroad 1956 -- 2017 $425 billion 2006 $425 billion $505 billion Interstate Highway System 2003 -- 2008 $1.5 billion $2.8 billion (2008) $3.1 billion I - 10 Katy Freeway Expansion (Interstate 10 in Texas) 1959 -- 1964 $320 million 1964 $2.44 billion Verrazano - Narrows Bridge
what was the largest single public works project in the history of america
Big Dig