The Corps’ Mississippi Valley New Orleans (MVN) plans to close between 30 to 40 bays on the Bonnet Carré Spillway today (Monday, April 8, 2019).
The MVN manages the opening and closing of bays to ensure the maximum flow at New Orleans remains at/or below the trigger point flow of 1.25 million cubic feet per second (cfs). The MVN reported the flow dipped below the trigger point level (less than 1.25 million cfs) on Friday, April 5, 2019.
Today’s maximum flow projection is 1.172 million cfs, this projection is based on the measured flow at Red River Landing, with calculations adjusted for downriver.
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, approximately 95 of the 350 bays will be opened at the end of the day. During the recorded crest 206 bays were open and the maximum flow at Red River Landing was estimated to be 1.455 million cfs.
BONNET CARRÉ SPILLWAY OPERATIONS
|DATE||CARROLTON GAUGE (NEW ORLEANS)||BAYS OPENED||TOTAL NUMBER OF BAYS OPEN||TOTAL NUMBER OF BAYS CLOSED||SPILLWAY DISCHARGE CUBIC FEET PER SECOND (cfs)|
|2/27/19||16.02 feet||28||28||N/A||23,000 cfs|
|2/28/19||16.20 feet||20||48||N/A||37,000 cfs|
|3/1/19||15.99 feet||40||88||N/A||75,000 cfs|
|3/2/19||16.00 feet||20||108||N/A||93,000 cfs|
|3/3/19||16.30 feet||0||108||N/A||95,000 cfs|
|¾/19||16.50 feet||40||148||N/A||133,000 cfs|
|3/5/19||16.5 feet||0||148||N/A||144,000 cfs|
|3/6/19||16.6 feet||0||148||N/A||148,000 cfs|
|3/7/19||16.6 feet||20||168||N/A||169,000 cfs|
|3/8/19||16.6. feet||20||188||N/A||187,000 cfs|
|3/9/19||16.7 feet||0||188||N/A||191,000 cfs|
|3/10/19||16.75 feet||10||198||N/A||196,000 cfs|
|3/11/19||16.6 feet||8||206||N/A||196,000 cfs|
|3/12/19||16.8 feet||N/A||206||N/A||196,000 cfs|
|3/13/19||16.8 feet||N/A||206||N/A||202,000 cfs|
|3/14/19||16.7 feet||N/A||206||N/A||204,000 cfs|
|3/15/19||16.7 feet||N/A||196||10||196,000 cfs|
|3/16/19||16.8 feet||N/A||196||0||199,000 cfs|
|3/17/19||16.9 feet||N/A||196||0||204,000 cfs|
|3/18/19||16.8 feet||N/A||196||0||207,000 cfs|
|3/19/19||16.9 feet||N/A||196||0||207,000 cfs|
|3/20/19||16.8 feet||N/A||196||0||210,000 cfs|
|3/21/19||16.8 feet||N/A||196||0||196,000 cfs|
|3/22/19||16.7 feet||N/A||196||0||194,000 cfs|
|3/23/19||16.7 feet||N/A||196||0||193,000 cfs|
|3/24/19||16.6 feet||N/A||196||0||185,000 cfs|
|3/25/19||16.6 feet||N/A||196||0||177,000 cfs|
|3/26/19||16.5 feet||N/A||176||20||158,000 cfs|
|3/27/19||16.6 feet||N/A||152||24||132,000 cfs|
|3/28/19||16.6 feet||N/A||135||17||131,000 cfs|
|3/29/19||16.7 feet||N/A||135||0||131,000 cfs|
|3/30/19||16.8 feet||N/A||135||0||131,000 cfs|
|3/31/19||16.8 feet||N/A||135||0||131,000 cfs|
|4/1/19||16.8 feet||N/A||135||0||135,000 cfs|
|4/2/19||16.7 feet||N/A||135||0||126,000 cfs|
|4/3/19||16.5 feet||N/A||135||0||114,000 cfs|
|4/4/19||16.5 feet||N/A||135||0||107,000 cfs|
|4/5/19||16.3 feet||N/A||135||0||101,000 cfs|
|4/6/19||16.2 feet||N/A||135||0||94,000 cfs|
|4/7/19||16.0 feet||N/A||135||0||86,000 cfs|
|4/8/19||16.0 feet||N/A||95 estimated||30-40||61,000 cfs|
The present conditions and updated forecasts for the Carrolton Gauge indicate the stage will remain at approximately 16.0 feet until April 21, 2019 before beginning a slow fall. These forecasts are complicated by taking into account the plans to continuing closing additional bays at the Bonnet Carré Spillway, the stage forecast for May 6, 2019 is 14.4 feet.
The MVN expects all bays will be closed by April 13, 2019.