List of most expensive U.S. 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 (2015$)	Project
1992-2006	$14.6 billion[1][2]	1982	$8.08 billion	$19.8 billion	Big Dig, Boston, Massachusetts
2002-13	$6.416 billion (est.)[3]				San Francisco–Oakland Bay Bridge East Span Replacement, San Francisco/Oakland, California
1988-2002	$5.0 billion [4]				Mon-Fayette Expressway, southwest Pennsylvania and northern West Virginia
2005–20 (est.)	$4.1 billion (est.)[5]				Ohio River Bridges Project, Louisville, Kentucky, and southern Indiana
2001-7	$3.6 billion[6]				Central Texas Turnpike, area around Austin, Texas
2007-11	$2.57 billion[7]				Intercounty Connector, Montgomery County, Maryland
1999–2008	$2.5 billion[8]				Woodrow Wilson Bridge Replacement, Washington, D.C., Northern Virginia, and southern Maryland
2015-21	$2.3 billion[9] (est.)				I-4 Ultimate corridor reconstruction, Orlando, Florida
2012–15	$4.25 billion				Alaskan Way Viaduct replacement tunnel, Seattle, Washington
2008–18	$1.8 billion[10] (est.)				Interstate 69 Extension SIU #3, Evansville to Indianapolis, Indiana
2013-21	$1.6 billion[11] (est.)				Wekiva Parkway, Orlando, Florida
2001–16	$1.4 billion[12] (est.)				I-95 New Haven Harbor Corridor Reconstruction, New Haven, Connecticut
1991–2003	$1.2 billion[13]				E-470, Denver, Colorado
1933-7	$37 million	1937	$37 million	$609 million	Golden Gate Bridge
2015-28	$67.6 billion (est.)	2013	$54.9 billion	$55.8 billion (est.)	California High-Speed Rail, Phase 1, California
1863-9	$124,548,691[14]	1873	$124,548,691	$2.46 billion	First Transcontinental Railroad
1956-2016	$425 billion	2006	$425 billion	$499 billion	Interstate Highway System
2003-2008	$1.5 billion	2001	$2.8 billion (2008)[15][16]	$3.1 billion	I-10 Katy Freeway Expansion (Interstate 10 in Texas)

See also

• Megaproject

References

1. Central Artery/Tunnel Project Website
2. "Boston’s ‘Big Dig’ finally opens to public - US news - NBC News". msnbc.com.
3. "FAQs".
4. Turnpike panel says high costs imperil Mon-Fayette, Southern Beltway projects, Pittsburgh Post-Gazette, April 27, 2007
5. Louisville Bridges Cost Now $4.1 Billion, The Urbanophile, October 6, 2007
6. Federal Highway Administration, Central Texas Turnpike Fact Sheet
7. Maryland Department of Transportation ICC Website
8. Woodrow Wilson Bridge Replacement Website
9. Tracy, Dan (17 February 2015). "I-4 Ultimate overhaul gets ceremonial start". Orlando Sentinel. Retrieved 18 February 2015.
10. "INDOT I-69: I-69".
11. "Frequently Asked Questions". Wekiva Parkway. Florida Department of Transportation & Central Florida Expressway Authority. Retrieved 18 February 2015.
12. COG panel OK with $498M spike in Q bridge cost, New Haven Register, August 9, 2007
13. "Final leg of E-470 nears completion". Denver Business Journal.
14. "Frequently Asked Questions about the Transcontinental Railroad".
15. "So what is the capacity of the Katy Freeway these days?".
16. "FHWA Office of Innovative Program Delivery: Project Profiles".