Animated diagram showing variation of Lake Okeechobee stage over the decades. The upper and lower bounds of represent the 25th and 75 percentile of each decade, or in other words fifty percent of stage values for each decade fall within the band. A simplified profile of the littoral zone and levee are shown in the background for reference.
Variation of natural systems for one.
Changes in water and levee management have also played a big role.