Today, the Mississippi River gauge at St. Louis was at 33.7′, a decline from higher river stages in previous weeks, the U.S. Department of Agriculture said. The National Weather Service forecasts river levels will continue to fall into mid-July.
Mississippi River barge traffic at St. Louis was halted from May 23 through June 23, when river levels exceeded 38′. River closures occur at certain gauges, which are set by the Coast Guard, Army Corps of Engineers, and barge industry representatives....
https://www.workboat.com/news/coastal-inland-waterways/navigation-improves-on-the-inland-waterways/