Monday marked the passage of six difficult years of rebuilding for the region, which is showing signs of a strong recovery from the costliest natural disaster in U.S. history. The storm killed more than 1,800 people, a majority of them in New Orleans where water filled up the city after levees and floodwalls built by the Army Corps of Engineers failed.
Most beachfront properties along the Mississippi Coast, from Waveland east to Pascagoula, were either destroyed or severely damaged and more than 200 lives were lost in the state.
Despite the hardships, many residents were upbeat.
"We're coming back, one house at a time, just like the community was built so many years ago," said Ronald Lewis, 60, who lives in New Orleans' Lower 9th Ward and runs a Mardi Gras Indian museum called the House of Dance and Feathers. He was one of the first residents to build back after Katrina.
To commemorate those lost in Katrina, Lewis and his Original Big 9 Social Aid and Pleasure Club marched a second-line down one of the only streets rebuilt in the neighborhood's worst-hit area and hung a new wreath on an oak tree for one member's mother and niece killed in the storm. The wreath changing has become a yearly ritual for the anniversary.
It wasn't an altogether sad event, with people coming out of their homes to dance to the music and greet friends.
Also Monday, New Orleans Mayor Mitch Landrieu and his sister, U.S. Sen. Mary Landrieu, D-La., joined hundreds of people for a walk to the top of a bridge in the Lower 9th Ward where a bouquet of flowers was tossed into the Industrial Canal. The floodwalls along the canal burst open during Katrina and led to deadly flooding.
Similar events were held elsewhere on the Gulf Coast. In Biloxi, the names of storm victims were read aloud as about 100 people gathered in prayer at the Katrina Memorial site on the Town Green.
At the University of New Orleans, the commemoration was more academic than emotional at a symposium to discuss a new book on the recovery by the Brookings Institution and the nonprofit Greater New Orleans Community Data Center. The meeting focused on government and civic improvements driven by a populace that's more engaged since the catastrophe.
"The region is well positioned to be a model of rebirth as long as it doesn't let this early progress slip," said Amy Liu, of the Brookings Institution, and an editor of the book "Resiliency and Opportunity."
The reforms in New Orleans include the creation and funding of an inspector general's office to oversee city contracting and an independent police monitor to help reform a scandal-plagued police department; a complete overhaul of the education system and a proliferation of independently run charter schools; and an evacuation system that takes into account the needs of those without cars or easy access to transportation.
Despite other troubles that have beset the region, such as last year's oil spill, it looks like the Gulf Coast is on the mend.
Mississippi Gov. Haley Barbour said that six years ago it looked like "the hand of God had wiped away the coast." Today, he continued, visitors to the Mississippi coast "can't tell anything ever happened because it's been rebuilt."