Three people among those injured were in critical condition, according to the Mississippi Highway Patrol. The collapse affected a portion of Highway 26 in George County, about 50 miles (80 km) northeast of Biloxi. "We've had a lot of rain with Ida, torrential," Mississippi Highway Patrol officer Calvin Robertson said. "Part of the highway just washed out." Seven vehicles plunged into the ditch, which was 50 feet (15 metres) long and 20 feet (6 meters) deep, Robertson said on CNN. Ida, one of the most powerful hurricanes ever to hit the US Gulf Coast, had weakened to a tropical depression by late Monday as it churned over Mississippi, where the system brought heavy rains overnight. The storm, which deluged Louisiana with rain and killed at least two people in the state, caused widespread power outages across Louisiana, Mississippi and Alabama, and prompted rescue operations in flooded communities around New Orleans. Ida is one of a series of powerful storms to pound the US Gulf Coast in recent years. Climate change is fueling deadly and disastrous weather across the globe, including stronger and more damaging hurricanes. On Tuesday, officials warned residents about the hidden dangers of flood waters that might bring wildlife closer to neighborhoods. Sheriff's deputies in St Tammany Parish were investigating the disappearance of a 71-year-old man after an apparent alligator attack in the flood waters brought on by the storm. The man’s wife told authorities that she saw a large alligator attack her husband in the tiny Avery Estates community about 35 miles (55 km) northeast of New Orleans on Monday. She stopped the attack and pulled her husband out of the flood water. Seeing that his injuries were severe, she took a small boat to get help, and came back to find her husband gone, the sheriff’s office said in a statement. POWER, WATER WOES By early Tuesday, about 1.3 million customers remained without power, most of them in Louisiana, according to PowerOutage which gathers data from US utility companies. Entergy Corp, a major power supplier, said it could take weeks before electricity is restored in the hardest-hit areas. Damage to eight high-voltage lines shut off electricity in New Orleans and nearby parishes, and parts of a transmission tower toppled into the Mississippi River on Sunday night. The outages were also straining the major waste disposal systems in the city. As of Monday, 80 of the 84 sewer pumping stations had lost power, raising the risk of backups. The New Orleans Sewerage & Water Board could not be reached for an update on Tuesday morning. Officials in Jefferson Parish in the New Orleans metropolitan area asked residents to conserve water to prevent sewage system backups. At least six large tanker trucks filled with potable water were stationed outside the main campus of Ochsner Medical Centre in New Orleans on Tuesday morning. Compounding the issues in Ida's aftermath, parts of Louisiana and Mississippi were under heat advisories with temperatures forecast to reach up to 105 Fahrenheit (40.6 Celsius) on Tuesday, the National Weather Service said. "The heat advisory for today does pose a big challenge," the agency's New Orleans outpost said on Twitter. "While you need to keep hydrated, know if you're under a boil water advisory." Widespread flooding and power outages also slowed efforts on Tuesday by energy companies to assess damages at oil production facilities, ports and refineries. MEMORIES OF KATRINA Ida made landfall on Sunday as a Category 4 hurricane, 16 years to the day after Hurricane Katrina, evoking memories of a disaster that killed more than 1,800 people in 2005 and devastated New Orleans. But a $14.5 billion system of levees, flood gates and pumps designed in the wake of Katrina's devastation largely worked as designed during Ida, officials said, sparing New Orleans from the catastrophic flooding that devastated the area 16 years ago. The state's healthcare systems also appeared to have largely escaped catastrophic damage at a time when Louisiana is reeling from a resurgence of COVID-19 infections that has strained hospitals.