Margaret McDermott Bridge, Steel bridge in Downtown Dallas, United States.

The Margaret McDermott Bridge is a steel structure spanning the Trinity River with two white arches that connect the eastern and western sides of Dallas. It provides separate roadways for Interstate 30 traffic along with dedicated paths for pedestrians and cyclists.

The bridge replaced a late-1950s to early-1960s I-30 crossing over the Trinity River that had reached the end of its life. It was one of three Santiago Calatrava-designed bridges planned for the Trinity River Project; budget issues scaled back its arches and scrapped a third bridge on I-35E. Contracts were awarded in mid-2012, the concrete I-30 span opened in 2013, and the steel arches were finished in 2017. The arched pedestrian and bicycle paths opened in June 2021 after cable anchor rods failed under wind-induced vibration and a repair approved in April 2019.

The bridge is named for Margaret McDermott, a Dallas philanthropist. Its two steel arches, each 350 feet (110 m) tall, carry the pedestrian and bicycle paths, which stayed closed after the arches were finished in 2017 and only opened in June 2021. Walkers and cyclists now cross the Trinity River on these separate arched spans beside the I-30 roadway.

The arched pedestrian and bicycle spans opened only in June 2021, after cable anchor rods failed under wind-induced vibration and the city approved a repair in April 2019. The paths sit on the two 350-foot steel arches, separate from the concrete deck carrying ten I-30 lanes and a reversible HOV lane.

The arched spans are separate from the concrete freeway bridge and carry the pedestrian and bicycle paths. Wind-induced vibration cracked cable anchor rods, keeping them closed for years after the freeway opened in 2013; pedestrians and cyclists only crossed from June 2021.