Hurricane Katrina: 20 Years On

Floodwaters from Hurricane Katrina fill the streets near downtown New Orleans, La., on Aug. 30, 2005. David J. Phillip/AP Photo

It was always supposed to be a Florida storm, New Orleans resident Sherry Grace said of Hurricane Katrina.

But 20 years ago, that tropical storm crossed the Everglades and grew over warm Gulf waters, becoming a catastrophe that is still considered one of the worst natural disasters to hit the Gulf Coast.