On March 31, 2025, the city of Louisville experienced rainfall that raised the Ohio River to its eighth-highest recorded level. The upper gauge typically reads about 12 feet, but by the first week of April, it had reached nearly 37 feet. There’s only a 4% annual chance of a flood event this size. Fortunately, the Metropolitan Sewer District (MSD) had it under control, thanks to the levee system built by the U.S. Army Corps of Engineers in the 1950s....