Storm & Flood Damage Recovery in Council Bluffs, IA

Those are two different things. A levee keeps the channel out; the water reaching your floor arrived from underneath it. Prolonged high stages lift the water table across the whole bottomland, and it comes in through the slab and the floor joint. Nothing overtopped and nothing failed. It is why an interior drain and a sump still earn their keep on protected ground, and why this catches people out every time.

Days rather than hours, and it is worth using. This river responds to rain and snowmelt across an enormous upstream basin, so the stage here reflects conditions far away and forecasts several days out are usually reliable. That makes moving belongings and raising equipment realistic rather than a scramble. Following the gauge forecast rather than the local weather is the habit that matters.

From the river, yes; from soil movement, not automatically. Loess holds a steep face when dry and loses strength when it stays saturated, so prolonged wet weather is a slope stability question up there. The signs are gradual: cracks parallel to a slope crest, soil pulling away from a foundation, a retaining wall starting to lean. Those are worth watching after a wet season rather than assuming elevation settles the matter.