At the beginning of the pandemic it was clear that was a State Health Department thing. I recall very clearly a meeting with my “people” and there were quite a few of them leaning back in their chairs and staring at the ceiling knowing what a mess it was going to be. We laughed at the thought of the Health Department nuts struggling to dig out their plan and try to put it in action.
Locally it became a boondoggle to spend money on pretty much whatever they wanted. I had seen that in the EM world right after 9/11. Lots of grant money flowed through the system.
The short answer to your question is that there WAS a plan and it had to do with limiting exposure to viruses like small pox or pneumonic plague. I don’t think the health department in our area ever found their binder.
I think it is pretty clear that the virus was not the "disaster". The government reaction to the virus was the "disaster". They should have had a plan for dealing with that. Maybe sheriffs telling the federal and state regulators to "F" off should have been part of the plan.