List of most expensive US public works projects - wikipedia List of most expensive US public works projects Below is a list of so - called megaprojects that are among the most expensive in U.S. history. Highways The following list includes projects to build new highways or improve existing ones, including roadways, bridges, and tunnels. It includes only projects that are underway or completed. Additionally, projects with multiple independent segments ( e.g., I - 69 Indiana - Texas Extension, Trans - Texas Corridor ) are not included, though individual segments may or may not make the list. Costs shown below exclude financing costs. 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 See also Megaproject References Jump up ^ Central Artery / Tunnel Project Website Jump up ^ `` Boston 's ' Big Dig ' finally opens to public - US news - NBC News ''. msnbc.com. Jump up ^ `` FAQs ''. Jump up ^ Turnpike panel says high costs imperil Mon - Fayette, Southern Beltway projects, Pittsburgh Post-Gazette, April 27, 2007 Jump up ^ Louisville Bridges Cost Now $4.1 Billion, The Urbanophile, October 6, 2007 Jump up ^ Federal Highway Administration, Central Texas Turnpike Fact Sheet Jump up ^ Maryland Department of Transportation ICC Website Jump up ^ Woodrow Wilson Bridge Replacement Website Jump up ^ Tracy, Dan ( 17 February 2015 ). `` I - 4 Ultimate overhaul gets ceremonial start ''. Orlando Sentinel. Retrieved 18 February 2015. Jump up ^ `` INDOT I - 69 : I - 69 ''. Jump up ^ `` Frequently Asked Questions ''. Wekiva Parkway. Florida Department of Transportation & Central Florida Expressway Authority. Retrieved 18 February 2015. Jump up ^ COG panel OK with $498 M spike in Q bridge cost, New Haven Register, August 9, 2007 Jump up ^ `` Final leg of E-470 nears completion ''. Denver Business Journal. Jump up ^ `` Frequently Asked Questions about the Transcontinental Railroad ''. Jump up ^ `` So what is the capacity of the Katy Freeway these days ? ''. Jump up ^ `` FHWA Office of Innovative Program Delivery : Project Profiles ''. Lists of most expensive items Transport Cars ( auctioned ) Media Books Coins Music videos Records Photographs ( of celebrities ) Paintings ( Indian artists ) Sculptures Video games Films animated non-English Finnish Indian Locations Buildings Cities for expatriate employees Streets United States public works projects Sports Association football Transfer record British transfers Dutch transfers Ukrainian transfers Baseball Contracts Social Divorces Most expensive things Retrieved from `` https://en.wikipedia.org/w/index.php?title=List_of_most_expensive_U.S._public_works_projects&oldid=783797143 '' Categories : Lists of superlatives United States transportation - related lists Lists of most expensive things Talk About Wikipedia Add links This page was last edited on 4 June 2017, at 18 : 32. About Wikipedia

Question: what was the largest single public works project in the history of america
Answer: Big Dig