It experiences long-term decadal shifts, too.
|Animated hydrograph showing current|
Lake O stage compared to previous decades
Take for instance the nineties and the aughts (i.e. 2000s):
The Lake shifted from a state of chronic flood (1990s) to prolonged drought (2000s) as driven by some combination of meteorological and management trends.
The chart above shows how current Lake stage measures up to decades past.