By Miguel Llanos, NBC News
St. Tammany Parish, a community north of New Orleans on Lake Pontchartrain, on Saturday ordered the mandatory evacuation of hundreds of residents, saying the failure of a lock along a canal was "imminent."
Parish officials said the order covers residents between Locks 1 and 2 on the Pearl River Diversion Canal. "Failure of Lock 2 is imminent," the parish said on its website.
Buses were being sent to help with the evacuations in the area north of the city of Slidell.
A parish spokesperson told NBC News that some 1,200 homes are in the evacuation area.
The order came as hundreds of thousands of people in the region tried to clean up after widespread flooding by Isaac.
Some 360,000 homes and businesses were still without power.
A $15 billion upgrade to New Orleans' levee and pump system after Hurricane Katrina helped protect the city during Isaac, but areas outside were not as lucky.
Earlier this week, a levee in Plaquemines Parish overtopped, flooding dozens of homes and drowning at least two people.
David J. Phillip / AP
Ray Dumes, left, and his son Deron carry out a couch as they clean up their home in LaPlace, La., on Saturday.
The flooding outside New Orleans led some local officials to wonder if the upgrades had pushed water into the outside areas.
Related: Isaac's rains hit Missouri, Illinois
The U.S. Army Corps of Engineers, responding to a request from Sen. David Vitter, R-La., said Saturday it would run models to see if that was the case, the New Orleans Times-Picayune reported.
Isaac's rains are now over the central U.S., helping ease the worst drought there in 50 years.
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