The spillway was opened for 44 days in February, March and April and has now been open for 48 days, breaking the one-year record of 75 days in 1973. The current opening has tied the third-place mark for consecutive days. The spillway was open for 48 days in 1937 and 57 in 1945.
A corps tweet Wednesday said the closing will begin when the river falls to 15.5 feet (4.7 meters) at the Carrollton gage.
That’s for safety of workers who must lower the timbers into rushing water, Roe said.
The amount of water passing through the spillway peaked May 21 and 22 at 161,000 cubic feet (4,560 cubic meters) per second. That’s enough water to fill the U.S. Capitol rotunda in about 8 seconds.
The spillway’s flow was down to 108,000 cubic feet (3,060 cubic meters) per second Thursday, Roe said.
The governors of Louisiana and Mississippi say freshwater has replaced brackish water in Lake Pontchartrain and left much of the Mississippi Sound far less salty than usual, killing oysters, hurting fish catches and damaging livelihoods. Both have asked the U.S. Commerce Department to declare a fisheries disaster.