Something else - how close are you to prisons? The staff WILL leave, and without staff inside and out, those in medium and low custody yards WILL get out, rather quickly, too. The prison gangs are already well organized with a defined rank structure, and will quickly fan out to the surrounding neighborhoods to acquire weapons, food and water, and depending on what type of inmate, victims as well. If you have close by prisons, expect a rush of inmates - and please don't tell me how much ammo you have. My complex has 5 units, and one unit alone has 1,400 inmates in it, with nothing between them and the nearest family but two fences with razor wire. There are two state complexes, two county jails, three private prison complexes, and one federal lockup in that town alone.
Just a thought for ya.