More rain may fall on the Upper Plains as people from Wisconsin to Missouri struggle with what's already on the ground.
The National Weather Service says it could mean higher crests than expected along the Mississippi River.
Cities and towns bordering rivers that drain into the Mississippi are coping, for the most part, with the floodwaters from earlier rains. Sandbagging has been successful in Cedar Falls, Iowa, and levees are holding in nearby Waterloo. But much of Vinton, Iowa, is flooded forcing evacuation of the county jail.
Elsewhere in the region, people are keeping a nervous eye on dams and levees. One levee gave way in Indiana flooding a vast stretch of farmland.
It's feared the flooding along the Mississippi could be the worst in 15 years.