Is Fort Calhoun's dry cask storage for high-level radioactive waste being protected against flood waters?

A photo showing the dry cask storage facility at the flooded Fort Calhoun nuclear power plant (see red circle in picture above) on the Missouri River seems to reveal that it is located outside of the vital area defended by the one-third mile long, 8 foot tall, Aqua Dam, a water filled rubber wall. This raises the concern that flood waters could block the foot vent that allows the cooling air flow convection currents to remove heat from the dry casks, leading to overheating.