UPDATE: Isaac: Rescues, outages and too much rain

NEW ORLEANS (AP) - A state official says an18-mile levee in southeast Louisiana's Plaquemines Parish will be breached to relieve pressure on it created by floodwaters from Tropical Storm Isaac.

The official says the levee won't be breached today because of weather conditions but it will happen as soon as equipment can be brought to the site.

The parish is a sparsely populated area south of New Orleans that's outside the federal levee system. It's been hit by severe flooding because Isaac has been moving at only about 5 mph.

Forecasters say Isaac, which was downgraded today, is expected to produce more inland flooding overnight. Its fierce winds have left hundreds of thousands without power.

Meanwhile, The Louisiana National Guard says they've wrapped up rescue operations in Plaquemines Parish.

National Guard spokesman Capt. Lance Cagnolatti says guardsmen are confident they've swept the thinly populated area and no one is still there.

Guardsmen rescued between 60 and 70 people in the area. None had any serious injuries, though an elderly woman who required dialysis was taken to a hospital. Cagnolatti says the search turned up no bodies in the floodwater.