Where is the Francis Scott Key Bridge? What to know about collapsed Baltimore bridge

The collapse of the Francis Scott Key Bridge, a major transportation link in the Baltimore area, sparked a massive search and rescue effort early Tuesday morning.

The bridge has been a critical transportation passageway along the East Coast for decades. Video captured the collapse, after Singapore-flagged container ship, the Dali, collided with one of the bridge's pillars.

The ship had caught fire, and several vehicles fell into the river below.

Here's what to know about the Francis Scott Key Bridge.

Follow here for live updates → Baltimore's Key Bridge collapses after ship collision; rescue effort underway

Where is the Francis Scott Key Bridge located?

The bridge crosses over the Patapsco River on I-695 and is the final link on the Baltimore Beltway, according to the Maryland Transportation Authority.

It is the outermost of the three tollways that cross Baltimore's Harbor.

How long is the Francis Scott Key Bridge?

The 4-lane bridge structure alone is 1.6 miles long. The facility also includes the Curtis Creek Drawbridge. Including approach roadways, the entire stretch is around 10.9 miles long, MDTA said.

Why did a ship hit the Francis Scott Key Bridge?

The ship, a container vessel chartered by Maersk, apparently lost power a few minutes before striking the bridge, a senior U.S. official told USA TODAY.

No Maersk crew or personnel were onboard the vessel when it struck the bridge, according to a statement from the company. It was operated by a charter company, Synergy Group, and owned by Grace Ocean Pte., based in Singapore, and ultimately bound for Sri Lanka.

Accidents like this, called Marine casualties, are not uncommon, the official told USA TODAY, with an allision (an immobile object being struck by a ship) occurring about every 10 years or so. Investigators will likely look into the cause of the power outage and whether there was a mechanical failure on the ship.

How old is the Key Bridge in Baltimore?

The Francis Scott Key Bridge opened in March 1977, according to the Maryland Transportation Authority.

What type of bridge is the Francis Scott Key?

The steel-arched bridge was the second-longest continuous-truss bridge span in the world when it was built and remains the second longest in the United States and third in the world, according to the American Civil Engineering Society .

When was the Francis Scott Key Bridge built?

Construction of the Francis Scott Key Bridge began in 1972.

Francis Scott Key Bridge has a deep history

According to the MDTA, the bridge crosses over the Patapsco River, near where Francis Scott Key, the bridge's namesake, was inspired to write the lyrics of the Star Spangled Banner.

Key is believed to have witnessed the bombardment of Fort McHenry on the night of Sept. 12, 1814, within 100 yards of the modern-day bridge. That battle is what inspired him to the national anthem.

How vital is the Francis Scott Key Bridge?

The bridge is critical to East Coast shipping. The port’s private and public terminals handled 847,158 autos and light trucks in 2023, the most of any U.S. port. The port also handles farm and construction machinery, sugar, gypsum and coal, according to a Maryland government website.

This article originally appeared on USA TODAY: Where is the Francis Scott Key Bridge? What type is it? What to know