day to conduct water rescues for people caught in the quickly rising water. the city of slidell hit hard by flooding. >> in about a three hour period we had probably 5 to 6 foot rise in the bayou. >> reporter: ida's path of destruction widespread, u.s. coast guard aerials show the severe impact in grand isle, louisiana. >> this is going to be very long ordeal in terms of getting everything cleaned up and certainly getting everything repaired. >> reporter: more than 1 million people are now without power after the storm including the entire city of new orleans. >> we're already seeing the power outages across the area. and the threat isn't over parent. >> reporter: overnight the city experienced an outage in its 911 emergency call system as the storm crossed the state. one major electrical transmission tower in jefferson parish collapsed in to the mississippi river. all eight major transmission lines providing power to the