Flushing Operations: Old River Control Structures and Atchafalaya River

Notice Number: 23-90/203066
Date: 07/18/2023 07:00 thru 07/18/2023 17:00

On 18 July 2023, between the hours of 7:00 a.m. and 5:00 p.m., the U.S. Army Corps of Engineers will significantly increase the diversion of water through the Old River Control Structures.

This diversion will increase the stage and velocity on the Atchafalaya River in the vicinity of Simmesport, Louisiana (and to lesser amounts downstream and upstream). These effects will occur between 8:00 a.m. and 6:00 p.m. Also, the draw through the Old River Control Structures (mile 311-315 Above Head of Passes on the Mississippi River) will increase.

Mariners should exercise extreme caution when navigating through these areas during the above-mentioned time period.


Chief, Technical Support Branch
Operations Division