The Margaret McDermott Bridge carries Interstate 30 over the Trinity River in Dallas, partly designed by Santiago Calatrava for the Texas Department of Transportation. Construction began in 2012 and the concrete section opened in 2013. The steel arches were finished in 2017, and the pedestrian and bicycle arches opened in June 2021.
The longest span is 1,125 feet (343 m). The arches rise about 350 feet (110 m), with pedestrian and bicycle paths inside. It carries 10 main lanes, a reversible HOV lane and four frontage road lanes, and belongs to the Trinity River and Horseshoe projects.
Cable anchor rods failed repeatedly from wind-induced vibration, creating a dispute among Calatrava, the contractor and officials. In April 2019 Dallas City Council approved a repair of over $7 million, and the arches opened later. Cost sources differ: $100 million or more, or over $200 million.
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