UNDATED (WCBI) - It's been a day of dramatic rescues as tropical storm Isaac pounds Louisiana and Mississippi. At least 75 people were rescued from the rooftops of their homes after hurricane Isaac's floodwaters poured over an 18-mile stretch of levee in a parish just outside New Orleans. Search teams are still trying to rescue several flood victims, as the giant storm dumps as much as an inch of rain per hour. Mississippi governor Phil Bryant says two major routes in Gulfport are closed because of massive flooding. More than 57,000 people are without power across the state.