When Was Hurricane Katrina? A Timeline of the Storm’s Impact

For many Americans, the question “When was Hurricane Katrina?” isn’t a simple date — it’s a marker of a disaster that reshaped the Gulf Coast and changed how the country views emergency response. This article breaks down the storm’s timeline, from its formation to the last floodwater pumped out of New Orleans, and answers the most pressing questions about its impact.

Landfall date: August 29, 2005 · Category at landfall: Category 3 · Confirmed deaths: 1,833 · Estimated damage: $125 billion · States affected: Louisiana, Mississippi, Alabama, Florida · Peak storm surge: 28 feet (Mississippi)

Key statistics from official sources are summarized in the table below.

How long did it take for Katrina waters to recede?

When did Katrina make landfall?

Hurricane Katrina made its initial landfall near Miami–Hollywood on August 25, 2005, as a Category 1 storm Britannica (encyclopedia entry). After crossing Florida and intensifying over the Gulf of Mexico, it struck southeast Louisiana near Buras in Plaquemines Parish at 6:10 a.m. local time on August 29, 2005 National Weather Service (official Katrina assessment report). At that moment it was a strong Category 3 hurricane with maximum sustained winds of about 125 mph NWS New Orleans/Baton Rouge (local weather service office).

How long did floodwaters persist in New Orleans?

The storm surge and rainfall overwhelmed the levee system, and by August 30 some 80 percent of New Orleans was underwater Britannica (visual timeline of Katrina). The National Weather Service assessment describes floodwaters of 15 to 20 feet covering roughly 80 percent of the city after levee overtopping and failures National Weather Service (Katrina assessment). More than 50 breaches opened in the defenses NOAA AOML (10th-anniversary review). Flooding persisted for weeks as the city’s pump stations were themselves submerged and the U.S. Army Corps of Engineers had to install temporary pumps.

When was the last floodwater pumped out?

The last floodwaters were pumped out of New Orleans on October 11, 2005, about 43 days after landfall Britannica (aftermath and recovery section). FEMA’s historic disasters page sets the official disaster period from August 29 to November 1, 2005 FEMA (historic disaster records).

The implication: The duration and severity of the flooding were a direct consequence of engineering failures that prolonged the city’s paralysis.

What caused the most deaths during Hurricane Katrina?

How did levee breaches contribute?

The breaches in the federal levee systems allowed Lake Pontchartrain and the Mississippi River Gulf Outlet to pour into neighborhoods that lay below sea level. The flood-control failures and overtopping caused extensive flooding in Orleans and St. Bernard parishes NWS New Orleans/Baton Rouge (anniversary background). Most victims who died in New Orleans drowned in the floodwaters that rose 15 to 20 feet above street level.

What was the role of storm surge?

Storm surge — water pushed ashore by hurricane-force winds — was the primary cause of coastal destruction. NOAA reports that more than a thousand people who had not evacuated drowned in the flood or died in the days afterward from exposure, lack of food, and lack of water NOAA AOML (official NOAA retrospective). In Mississippi, the surge reached 28 feet, sweeping away entire coastal communities.

Why did many people drown?

The combination of late evacuation orders, insufficient shelter capacity, and the rapid rise of water after levee failures trapped thousands in attics and on rooftops. The official death toll stands at 1,833 confirmed deaths, according to FEMA FEMA (historic disaster page). The majority of these fatalities were directly caused by drowning.

The catch: The design assumptions of the levee system did not account for the extreme surge, making the death toll a preventable consequence of underestimated risk.

What happened to the people who lost their homes in Katrina?

What federal assistance was available?

FEMA provided temporary housing assistance, including hotel vouchers, rental assistance, and mobile homes. The agency also distributed disaster unemployment assistance and individual grants for home repairs. However, the response was slow and widely criticized for inefficiency. FEMA’s historic page notes that Katrina displaced families to all 50 states FEMA (historic disaster record).

How many people were displaced?

Over 1 million people were displaced from the Gulf Coast region. Many left Louisiana, Mississippi, and Alabama and resettled in Texas, Georgia, and other states. The displacement was the largest since the Dust Bowl.

Where did evacuees go?

The most common destination was Texas, particularly Houston’s Astrodome, which housed tens of thousands. Other evacuees settled in Atlanta, Baton Rouge, and as far away as California. The diaspora reshaped communities across the country.

What this means: The displacement created a lasting demographic shift, with many families scattered permanently across the country.

Who got blamed for Hurricane Katrina?

What criticism did FEMA face?

FEMA director Michael Brown resigned under fire for the agency’s slow and disorganized response. Reports showed that supplies sat in warehouses while victims waited on rooftops. President Bush initially praised Brown, but later his remark “Brownie, you’re doing a heck of a job” became a symbol of the administration’s disconnect.

Was the Army Corps of Engineers blamed?

The Army Corps of Engineers was heavily criticized for designing and maintaining the levee system that failed. The hurricane-protection system was built with a design flaw — the floodwalls were not anchored deeply enough to resist the surge pressure. The Corps acknowledged that the failures were “systemic” and attributable to a lack of proper risk assessment.

Did political leaders face consequences?

President George W. Bush’s approval rating dropped sharply after Katrina. His administration lost public trust, and the disaster became a defining negative event of his tenure. The mayor of New Orleans, Ray Nagin, and Louisiana Governor Kathleen Blanco also faced criticism, but Brown bore the brunt of the blame.

The implication: Accountability fell hardest on FEMA’s leadership, but the systemic failures of the levee design and the slow federal response exposed deep weaknesses in emergency-management policy.

What is a storm surge?

How does storm surge cause flooding?

Storm surge is a rise in water level caused by hurricane-force winds pushing ocean water toward the coast. During Katrina, the surge coincided with high tide, amplifying the inundation. The surge overwhelmed the levee system — a fact documented by the National Weather Service assessment National Weather Service (Katrina assessment).

What was the storm surge height during Katrina?

The surge reached 28 feet along the Mississippi coast, erasing entire towns like Waveland and Pass Christian. In New Orleans, the surge funneled up the funnel-shaped topography of Lake Borgne and the Mississippi River Gulf Outlet, pushing water into the Industrial Canal and triggering levee breaches.

How does storm surge differ from wind damage?

While wind damage can destroy structures, storm surge is the deadliest threat of a hurricane. NOAA AOML notes that more than a thousand people drowned from the surge NOAA AOML (10th-anniversary review). Wind damage tends to be structural; surge damage is both structural and fatal to people who cannot escape the rising water.

The pattern: The disconnect between wind rating and water threat continues to mislead evacuation decisions.

Hurricane Katrina timeline

• August 23, 2005 — Tropical depression forms near the Bahamas. Britannica (storm formation)
• August 24, 2005 — Becomes Tropical Storm Katrina. Britannica (storm formation)
• August 25, 2005 — Makes landfall in Florida as a Category 1 hurricane near Miami–Hollywood at 6:30 p.m. Britannica (Florida landfall detail)
• August 29, 2005 — Landfall in Louisiana near Buras as a Category 3 hurricane at 6:10 a.m. CDT. Catastrophic storm surge and levee breaches follow. National Weather Service (landfall timing)
• August 30, 2005 — Levee failures cause 80% of New Orleans to become submerged. Britannica (flood extent)
• September 1, 2005 — Flooding peaks; federal response begins in earnest.
• October 11, 2005 — Last floodwater pumped out of New Orleans — 43 days after the initial landfall. Britannica (pumping completion)

What this shows: The timeline reveals a rapid succession of failures and a slow recovery, with the city’s flooding persisting for more than six weeks.

Clarity: what we know vs. what remains unclear

Voices from the storm

More than 50 breaches opened in the defenses, flooding large portions of the city below sea level.

— NOAA AOML, 10th-anniversary retrospective

Floodwaters of about 15 to 20 feet covered roughly 80 percent of New Orleans after overtopping and levee failures.

— National Weather Service, Katrina assessment report

Hurricane Katrina caused more than 1,800 deaths and displaced families to all 50 U.S. states.

— FEMA, historic disaster records

For Gulf Coast communities, the lesson of Katrina is clear: storm surge and levee failures remain the deadliest threats, and preparation must match the scale of worst-case scenarios. For residents and policymakers, the choice is between investing in stronger flood protection before the next surge or facing another 43-day deluge.

Frequently asked questions

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