What's fascinating is that it's designed to fluctuate dramatically, with its depth swinging by tens of feet between drought and flood, so unlike a natural lake, the figure is a design maximum rather than a stable measurement. This unique characteristic is a result of its purpose as a reservoir, which is to control flooding and provide a steady water supply to the surrounding areas. In times of drought, the lake's water level can drop significantly, exposing large areas of shoreline, while during heavy rainfall, the water level can rise rapidly, sometimes even overflowing the dam. 

This constant fluctuation is a testament to the lake's importance in managing the water resources of the region.