ALDOT Closed the Bankhead Tunnel Ahead of Hurricane Ida’s Storm Surge, Then Reopened It

MOBILE, Ala. — State transportation crews shut the Bankhead Tunnel in downtown Mobile on Sunday evening ahead of predicted storm surge from Hurricane Ida, then reopened it the next morning as the storm moved further inland and the worst of the threat passed the Port City.

The Alabama Department of Transportation closed the tunnel at 7 p.m. as a storm surge warning took effect for coastal Mobile County. Forecasters expected waves of 2 to 4 feet along the coast and 5 to 8 inches of rain across the area as Ida came ashore to the west, pummeling southeast Louisiana before its remnants turned north.

The precautionary closure is a familiar drill along the northern Gulf Coast, where a handful of low-lying crossings must be protected before every significant storm. For Mobile, the Bankhead Tunnel is the most exposed piece of downtown’s road network — a structure that sits below sea level for most of its length and depends entirely on the pumps and barrier operations that keep water out.

Weather holds like Sunday’s are timed against the tide as much as the storm. Surge riding in on a rising tide reaches farther inland than the same surge against an outgoing tide, so transportation officials watch predicted water levels hour by hour when they pick a closure time. The 7 p.m. shutdown reflected that calculation — ahead of the overnight rise, but late enough that weekend drivers still had most of the evening to cross downtown unhindered.

ALDOT’s overnight reopening signaled that the city’s fears had, for the most part, not materialized downtown. Ida’s landfall well to the west spared Mobile the catastrophic surge that Katrina pushed into the same waters in 2005, but the storm still left its mark on the region’s low-lying roads by daybreak.

Why tunnels close before storms

The Bankhead Tunnel carries Government Street beneath the Mobile River, and its low-lying entrances flood quickly when surge pushes water up the river. Preemptive closures keep drivers from getting trapped in a flooded tube and give ALDOT room to work without rescues underway.

The tunnel opened in the early 1940s as a Works Progress Administration-era project, named for Alabama’s longtime senator John Hollis Bankhead, and it remains one of the oldest vehicular tunnels on the Gulf Coast. Its tube runs beneath the river between Government Street on the west and a portal that surfaces on the east bank — a piece of 1940s engineering that predates the interstate tunnels that later joined it under the same waterway.

Because the tunnel’s approaches sit in the lowest reach of downtown, rising water finds them first. When surge rides up the Mobile River with the tide, the portals act as drains rather than doorways, and the only safe response is to empty the tube and seal it before the water arrives. That is what the 7 p.m. Sunday closure accomplished: no drivers in the tunnel, no stranded vehicles, and a maintenance crew free to assess and pump the facility as conditions allowed.

The closure also illustrates a broader truth of Gulf Coast emergency management — that protecting infrastructure often means taking it out of service in advance. A tunnel that stays open until water is pouring in produces exactly the kind of life-threatening situation closures exist to prevent.

Ida’s threat to the northern Gulf

Hurricane Ida strengthened rapidly in the Gulf of Mexico before striking the Louisiana coast as one of the most powerful storms ever to come ashore in the state, and Mobile County spent the weekend on the alert side of the forecast cone. A storm surge warning for coastal Mobile County predicted the 2 to 4 feet of inundation that forecasters ultimately expected along the shoreline, while the rain forecast of 5 to 8 inches raised familiar concerns about street flooding away from the water.

Mobile’s vulnerability to storms making landfall to the west is well documented. Surge from hurricanes moving up the Gulf pushes water east into Mobile Bay and up the rivers that feed it, and the city’s low-lying waterfront — from downtown to the causeway — sits directly in the path of that water. Even distant landfalls can flood the same crossings that ALDOT monitors closely.

The department’s storm playbook includes pre-positioning equipment, sealing or monitoring low-level structures, and timing closures to hit the window before surge arrives. Sunday evening’s 7 p.m. shutdown fit that window: ahead of the overnight rise in water, late enough that Sunday drivers could still cross downtown, and early enough to clear the tube before conditions deteriorated.

Flooding lingered on the Causeway

By Monday morning, with the tunnel back open, water remained a problem elsewhere: U.S. 90 across the Cochrane Causeway experienced flooding during the morning commute, and officials urged drivers to proceed with caution along the low-lying bay route.

The causeway — the historic strip of land that carries U.S. 90 across the upper reaches of Mobile Bay between Spanish Fort and downtown Mobile — is famous for flooding when winds push bay water over its shoulders. The route sits just above the waterline for much of its length, and northeast winds stacking water into the head of the bay can close it even in modest storms. It has repeatedly served as the region’s visual barometer for how much water a system is moving.

Commuters Monday found the familiar tableau: water lapping across the roadway shoulders, closures or cautions at the worst sections, and the long line of drivers who use the scenic route as an alternative to the Interstate 10 Bayway weighing whether the trip was worth the risk. Officials’ advice was consistent with every high-water event on that road — never drive through water of unknown depth, and treat the flooded sections as closed regardless of how shallow they appear.

The contrast between the two corridors told the story of Ida’s glancing blow to Mobile: the tunnel, protected by a deliberate closure, reopened without incident, while the causeway, which cannot be sealed against the bay, took the water that came its way.

Mobile’s storm-hardened crossings

The Bankhead Tunnel is one of several underwater crossings that define Mobile’s road network, and each requires its own storm strategy. The newer George Wallace Tunnel carries Interstate 10 beneath the river nearby, and the Jubilee Parkway — the Bayway — stretches the interstate across the bay itself. Together they form the region’s transportation spine, and all of it is exposed to the same forces ALDOT weighed Sunday evening.

Opening the Bankhead back to traffic Monday morning restored a key downtown connection for commuters, and it demonstrated the value of the closure-and-reopen cycle: facilities that are protected in advance come back quickly, while those left exposed to surge can require days or weeks of repair. On the Gulf Coast, where a single storm season can stress every crossing at once, that turnaround time is a measure of resilience.

Mobile’s tunnels hold a special place in the city’s identity as well. The Bankhead’s twin-tube predecessor era, its distinctive spiral ramps at the portals, and the experience of descending beneath the river have made the tunnels landmarks in their own right — structures residents follow during storms with the same attention they give the bay itself.

The morning after a near miss

Ida’s aftermath in southeast Louisiana — devastating wind damage, widespread power outages, and catastrophic levee overtopping in the New Orleans area — threw Mobile’s experience into sharp relief. The city took the precautions, watched the water, and came through with flooded shoulders and a closed causeway rather than destruction, a result of the storm’s track and the margin of preparation.

Local officials used the episode to reinforce familiar safety messages: never drive into floodwater, treat road-closure barriers as absolute, and remember that surge is the deadliest element of a landfalling hurricane even when the wind arrives elsewhere. The 2 to 4 feet of predicted surge for coastal Mobile County was modest by hurricane standards, yet enough to close major routes and force the region’s routine storm choreography into motion.

The 5 to 8 inches of rain that fell across the area also tested the drainage systems that carry Mobile’s streets through every storm, and crews spent the day after the storm clearing drains and checking the usual trouble spots as leftover bands moved through.

What comes next

With the Bankhead Tunnel reopened and the causeway drying as winds eased, the region turned from preparation to recovery and assessment. ALDOT’s quick Sunday-night closure and Monday-morning reopening will stand as another entry in the department’s long practice of storm operations on the Gulf Coast — unglamorous work that happens between the forecast and the flood.

For Mobile drivers, the takeaway was simple: when a surge warning goes up, plan for the tunnels and low routes to close first and reopen last, and check conditions before trusting a route across the water. The infrastructure did its job this time, and the city got through a frightening Gulf storm with stories about a flooded commute rather than a drowned tunnel.