A makeshift concrete and sandbag flood wall is constructed across the Walnut Street bridge in Des Moines ahead of expected flood waters earlier this afternoon. Several bridges leading into the city were closed late today as the rising Des Moines River was expected to flood over and cover the bridges, making them impassable.

More severe thunderstorms are expected to begin dumping more water on the area beginning tomorrow through Thursday on a part of the state that typically receives 1.75 inches of rain in June and thus far has been inundated by 8.25 inches.