U.S. Ultimatum to Iran: The Threat of "Bridge Day"

United States President Donald Trump has issued a severe ultimatum to Iran regarding the crucial Strait of Hormuz. If the strait is not opened by an unspecified Wednesday, the U.S. has threatened to target Iranian critical infrastructure, including bridges and power plants. President Trump reportedly referred to this potential action as “Bridge Day.”

"Bridge Day" could see the U.S. targeting Iranian critical infrastructure, including bridges and power plants, if the Strait of Hormuz is not opened.

This ultimatum follows a series of reported U.S. and Israeli strikes on various Iranian facilities. These prior targets have reportedly included universities, hospitals, schools, research centers, and pharmaceutical companies. A recent U.S. strike reportedly destroyed the B1 bridge in Karaj, resulting in eight civilian fatalities. Analysts suggest these actions may be part of a broader strategy to "de-develop" the nation.

Iran's Bridge Management System (BMS) reports approximately 300,000 bridges and technical structures within the country. Of these, about 185 bridges exceed 100 meters in length, and 42 have a main span of over 50 meters. International observers have expressed significant concern regarding the implications should the U.S. proceed with targeting Iran's bridges.

Key Iranian Bridges and Potential Risks:

Persian Gulf Bridge (Qeshm Island)

Location: Hormuzgan province
Dimensions: 3.4km (2.1 miles) long
Status: Unfinished, with 15-18 percent physical progress and substantial underwater foundations already in place.
Background: A long-planned project initiated in 2011, this bridge is intended to connect Qeshm Island—believed to house an underground missile arsenal—to Bandar Abbas, Iran’s main mainland port. It is a central component of the International North-South Transport Corridor, involving India and Russia.
Risk: Representing an investment up to $700 million, targeting its foundations would impact decades of national planning and Chinese-backed credit lines, significantly hindering a direct mainland link to the strategically important island.

Lake Urmia Bridge (Shahid Kalantari Bridge)

Location: Between East and West Azerbaijan provinces
Dimensions: 1.7km (1 mile) long
Background: Inaugurated in November 2008 after 29 years of complex construction, a testament to the challenges posed by the hypersaline and muddy lake bed.
Risk: This bridge connects Tabriz and Urmia, reducing driving distance by 110km. Its destruction could cause an ecological disaster by dumping steel pilings and concrete into the shrinking lake.

Sadr Multilevel Expressway

Location: Tehran
Dimensions: 11km (7 miles) long, supported by 234 pillars.
Background: Inaugurated in November 2013, this is the 11th highest bridge globally and the longest multilevel bridge in the Middle East, constructed entirely by Iranian engineers.
Risk: Serving as a daily commuter artery for millions in Tehran, an attack could result in significant urban casualties and severely disrupt the capital’s transport and emergency evacuation systems.

Karun 4 Arch Bridge

Location: Chaharmahal and Bakhtiari province
Dimensions: 378 meters (1,240ft) long, 3,800 tonnes.
Background: Iran’s longest arch bridge, designed and constructed by Iranian experts, inaugurated in 2015.
Risk: Providing a crucial route between Shahr-e-Kord and Izeh, its unique location over a dam reservoir means bombing it risks secondary damage to the hydroelectric facility, potentially leading to fatal flooding downstream.

Ghadir Cable-stayed Bridge (8th Bridge)

Location: Ahvaz, Khuzestan province
Dimensions: 1,014 meters (3,327ft) long, 22 meters (72ft) wide.
Background: Construction began in 2005, fully opened to the public in early 2012.
Risk: Spanning the Karun River in the heart of Ahvaz, a center for Iran’s oil and steel sectors, its destruction would divide the city, obstructing daily movement and emergency services in a province already affected by previous airstrikes.

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