Bonnet Carré Spillway Operation 3519 (Mardi Gras Day)

The Corps’ Mississippi Valley New Orleans (MVN) does not intend to open any bays on the Bonnet Carré  Spillway today (Tuesday, March 5, 2019).  The MVN manages the opening of bays in order to keep the maximum flow at New Orleans at or below the target point flow of 1.25 million cubic feet per second (cfs). 

The MVN will continue to oversee the operation of the Spillway as a flood control structure in accordance with the approved Bonnet Carré  Spillway Water Control Manual. The MVN intends to gradually open a total of 200 bays (approximately) based on efforts to maintain the maximum flow at New Orleans.   The MVN advises the crest above the Spillway is presently forecasted to arrive on March 16, 2019.  The latest maximum flow projection is 1.412 million cfs, these projections are based on the measured flow at Red River Landing, with timing adjusted for downriver.

The trigger flow requiring the operation of the Morganza Spillway is 1.5 million cubic feet per second, the MVN does not anticipate operating the Morganza Spillway.

    BONNET CARRé SPILLWAY OPERATION   

DATECARROLTON GAUGE (NEW ORLEANS)BAYS OPENEDTOTAL NUMBER OF BAYS OPENEDSPILLWAY DISCHARGE CUBIC FEET PER SECOND (cfs)
2/27/1916.02 feet282823,000 cfs
2/28/1916.20 feet204837,000 cfs
3/1/1915.99 feet408875,000 cfs
3/2/1916.00 feet2010893,000 cfs
3/3/1916.30 feet010895,000 cfs
3/4/1916.50 feet40148133,000 cfs
3/5/1916.5 feet0148136,000 cfs

The Carrolton Gauge is now expected to reach 17.0 feet on March 13, 2019 and to remain at that stage until March 23, 2019.  The operation of the Bonnet Carré Spillway will artificially control the crest at 17 feet (approximately) and maintain the maximum flow at New Orleans at or below 1.25 million cfs.