The Key Bridge

September 13–14, 1814

By the dawn's early light.

For twenty-five hours, British warships shelled Fort McHenry at the mouth of Baltimore's harbor. A 35-year-old lawyer named Francis Scott Key watched from a truce ship anchored in the Patapsco a few miles downriver, held there until the attack was over.

The flag was still there.

At dawn he saw it flying over the fort and wrote a poem on the back of a letter. It became the national anthem in 1931. A century and a half later, Maryland built a bridge near the spot where his ship had been anchored, and gave it his name.

1972–1977

The harbor needed a second crossing.

By the late 1960s the Harbor Tunnel was choking on traffic. Engineers studied a second tunnel and chose a bridge instead: cheaper, and open to the gasoline and propane trucks that tunnels can't take. Work began in 1972 from Hawkins Point and Sollers Point, on opposite shores.

A steel arch you could see from anywhere.

The design was a continuous truss: three spans sharing one unbroken frame of steel. Its main span was the second longest of its kind in the world when the bridge opened on March 23, 1977.

Length

1.6 mi

Main span

1,200 ft

Clearance

185 ft

Cost

$60.3M

1977–2024

Forty-seven years of ordinary.

The Outer Harbor Crossing carried the Beltway, I-695, over the river. About 31,000 vehicles a day. Tankers that couldn't use the tunnels. Dundalk to Curtis Bay. The night shift at the port. The view from Fort Armistead.

You knew it by its shape.

A steel arch over a working harbor, the first thing you saw coming up the bay and the last thing leaving. In Baltimore it was simply the Key Bridge.

Per day

31,000

In 2021

11.3M

Lanes

4

Years

47

March 26, 2024 · 12:36 AM

Four minutes.

Two tugs pull the container ship Dali, 984 feet long and bound for Colombo, Sri Lanka, away from Seagirt Marine Terminal. Aboard are two harbor pilots, twenty-one crew and 4,680 containers. Up on the bridge, a road crew is filling potholes on the overnight shift.

1:07 AM

Into the channel.

The tugs let go. The Dali enters the Fort McHenry Channel and the pilots set a course of 141 degrees, about eight knots, lined up for the 1,200-foot gap between the bridge's main piers.

1:24:59 AM

Blackout.

Three ship lengths from the bridge, every light on the ship goes dark. The pumps stop, the engine shuts down, the rudder freezes. She is doing nine knots with no propulsion and no steering. The crew gets the lights back within a minute, but the engine stays dead, and she begins swinging to the right, toward Pier 17.

1:27 AM

Mayday.

The pilots call for tugs and order the anchor dropped. Then the lights go out a second time. A pilot radios a warning to all traffic, and the Transportation Authority police are ordered to close the bridge at 1:27:53. Officers at both ends stop the cars. Seventy-seven seconds later, the ship arrives.

1:29:10 AM

Impact.

The Dali's starboard bow strikes Pier 17 at 6.5 knots, about seven and a half miles an hour. The pier fails. Because the main spans are one continuous truss, nothing holds the rest. Six spans fall into the river and across the ship's bow within seconds.

1:30 AM

Silence.

The road inspector, walking the span, runs north and reaches a section that stays standing. One worker frees himself from his truck and is pulled from the river by a police boat at 1:55. The other six were in their vehicles. The police stop has kept every car off the span, and all twenty-three people aboard the Dali survive.

Spring 2024

Fifty thousand tons.

The Port of Baltimore is closed. Divers work blind in the wreckage. The Chesapeake 1000, one of the largest floating cranes on the East Coast, starts lifting pieces of truss the size of buildings out of the river.

May 13. May 20.

Engineers cut the span draped over the Dali with explosive charges and lift it off the bow. A week later the ship is refloated and towed back to the terminal it left fifty-five days earlier.

June 10.

The federal channel, 700 feet wide and 50 feet deep, reopens seventy-six days after the collapse. The Dali leaves Baltimore for Norfolk on June 24.

The investigation · November 18, 2025

"One wire, among thousands."

The National Transportation Safety Board traced the collapse to a label. A band wrapped around a signal wire kept it from seating in a terminal block aboard the Dali. The loose connection tripped a breaker. The breaker took down the ship.

Jennifer Homendy, NTSB chair

Then the second blackout.

The crew had been feeding the generators through a flushing pump instead of the service pump, and it didn't restart on its own. The breakers were set to manual, so the first blackout lasted 58 seconds instead of 10.

The bridge was built for 1977 ships.

The concrete dolphins guarding its piers were sized for the vessels of that era. Ships had grown enormously since, and the piers were never reassessed against them. The NTSB put the collapse risk at nearly 30 times the acceptable threshold, and told the owners of 68 other bridges in 19 states to check their own.

2025–2030

The next bridge.

The replacement is a cable-stayed bridge: two towers more than 600 feet tall, 144 cables, and a 1,665-foot main span, the longest of its kind in the country. It will clear the water by 230 feet, 45 more than the old bridge.

The first numbers were guesses.

The $1.7 billion price and the fall 2028 opening were promised within two weeks of the collapse, before a line had been drawn, to get federal money moving. Real engineering didn't start until 2025. When it did, the bridge got bigger and the rules got stricter.

Built for today's ships, not 1977's.

Federal reviewers set the clearance: at least 230 feet up and 1,100 feet across. The NTSB had found the old dolphins were the wrong size in the wrong place, so the new piers get a protection system built to current ship-collision standards. That system, the taller towers, and materials priced far above the 2024 assumptions drove the estimate.

2024 estimate

$1.7B

2025 estimate

$5.2B

Opening

2030

Clearance

230 ft

Figures as of October 9, 2026.

Then the builder dispute.

Kiewit designed the bridge and started the piles. Its price to build the rest came in far above the state's own estimate, with a longer schedule, so in 2026 Maryland parted ways with the firm and split the remaining work into four contracts to bid again. The main span is still being competed, and demolition of the old approaches only went out to bid in August 2026. The reset cost most of a year.

What's there now.

Pile drivers are in the river and work trestles reach out from both shores. The state's date is the end of 2030, and the reporters covering the rebid expect it to slip. Congress promised in December 2024 that the federal government would pay for all of it; the current administration has hinted it may not feel bound by that, and Maryland is suing the ship's owners to recover what it can.