Today is the 107th day the Mississippi River has been above flood stage. With more rain expected in northern Mississippi, the crest and the date of that crest will probably change a couple more times.
The current projection is 51 feet on June 12, 2019. It should stay at the crest for a week or so then begin a slow drop over the following 28 days. On July 12 the prediction is for the river to be at 49 feet, still 6 feet above flood stage.
The impact on the Great Backwater flood is the gates at Steele Bayou cannot be opened when the river is rising. So any rainfall in the Backwater will increase the Backwater flood level. Currently, the Backwater is at 97.6 feet, but with additional rain, it is projected to go up to 98 to 98.5 feet. At 98.5 feet, 550,000 acres are underwater including 225,000 acres of farmland.