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The Bonnet Carre Spillway was opened on May 9, to divert flood water from the Mississippi River into Lake Pontchartrain.
330 of the spillway’s 350 bays were opened before the corps started closing them on June 12.
The last 20 bays were closed on Monday.
On May 14, the Morganza floodway was opened to diverted water from the Mississippi into the Atchafalaya River, which carried it into the Gulf of Mexico.
It caused some flooding in the Atchafalaya Basin.
The number of gates opened on the Morganza peaked at 17.
Only one gate remained open as of Monday morning.