The park again suffered major flooding in 1975, 1996, 2004, 2006, and 2011. Each caused substantial damage, but the 1975 and 1996 floods occurred during the off-season. Although the January 1996 flood left substantial damage, the worst occurred after the waters receded, when everything froze, making cleanup and repair throughout the amusement park difficult. The September 2004 flood, caused by the remnants of Hurricane Ivan, was only a half-day affair and Knoebels staff had the amusement park partially reopened by mid-afternoon.