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Rescues as Isaac's surge tops levee in Plaquemines Parish, La.

Gerald Herbert / AP

People and a dog who were rescued from their flooded homes are loaded into a Louisiana National Guard truck, after Hurricane Isaac made landfall and flooded homes with 10 feet of water in Braithwaite, La., in Plaquemines Parish on Aug. 29.

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People rest in a rescue truck atop a levee next to floodwaters after being rescued in Plaquemines Parish on Aug. 29 in Braithwaite, Louisiana. Dozens were reportedly rescued in the area after levees were overtopped by floodwaters from Hurricane Isaac. Today is the seventh anniversary of Hurricane Katrina.

David J. Phillip / AP

Carlo Maltese and his dog Pin get off a boat after being rescued from his flooded home as Hurricane Isaac hits Wednesday, Aug. 29 in Braithwaite, La.

Mario Tama / Getty Images

Rescue workers look out at floodwaters from a levee on Aug. 29, 2012 in Braithwaite, La . Dozens were reportedly rescued in the area in Plaquemines Parish after levees were overtopped by floodwaters from Hurricane Isaac.

Gerald Herbert / AP

Hurricane Isaac makes second landfall, floods coastal communities, but levees still hold.

 From NBC News: New evacuations were ordered Wednesday as slow-moving Hurricane Isaac caused one levee outside New Orleans to overtop and threatened others. Inside New Orleans, levees and pumps were protecting the city from widespread flooding, but Isaac had cut power to a third of Louisiana's households and was expected to lash the state with heavy rain and winds into Friday.

In Plaquemines Parish, the storm surge overtopped an 18-mile stretch of levee that sits eight feet above the Mississippi River. National Guardsmen and residents rescued dozens of people trapped in homes. 

NBC's Gabe Gutierrez reports on ongoing rescue efforts to reach dozens of people believed to be trapped in their homes due to flooding from an overtopped levee.

"We have flooding, inundated four-to-nine feet in areas," parish emergency management official Guy Laigast told the Weather Channel. "We've got homes that have been inundated."

"It's piling that water up on the east side of the Mississippi River," he added. "All that water is ponding up in that area, and that's what's causing the overtopping."

The area had been under a mandatory evacuation order, but only half of the 2,000 residents reportedly had left ahead of Isaac's landfall Tuesday. Click here to read the latest reports about Hurricane Isaac.

 

See a High-Definition image of Hurricane Isaac illuminated by moonlight, captured by satellite.