Ft. Calhoun is the designated spent fuel storage facility for the entire state of Nebraska...and maybe for more than one state.
Calhoun stores its spent fuel in ground-level pools which are underwater anyway - but they are open at the top. When the Missouri river pours in there, it's going to make Fukushima look like an x-ray. But that's not all. There are a LOT of nuclear plants on both the Missouri and Mississippi and they can all go to hell fast.
BTW, US plants hold about four times OVER capacity in their spent fuel pools PLUS all the new and recently removed fuel from Calhoun...the plant was officially being refueled.
Be aware that Ft Calhoun isn't a BWR like Fukushima - it's a PWR. But that doesn't matter, because the fuel is all sitting OUTSIDE the reactor waiting to wash away or explode - which will destroy about 15,000 square miles of what used to be the corn belt. That's all being washed away by the flood waters anyway.