C.O.G. 100 tire choice

Since this will be my first time riding in Iowa I'm debating tire choice. What are the roads in that area like?

I see this is an old post but still worth replying to.

Iowa gravel is all over the place!   Typically road maintenance crews can put down a fresh layer of crushed limestone every 1-2 years, so a fresh application can be like lumpy oatmeal you sink into.   I sometimes use 2+" mountain bike tires on these roads for comfort.   Other times you got almost-dirt & mud on older C-roads that don't drain well.