Will Midwest flooding crest in Dallas?

According to this story in today's New York Times, Cedar Rapids, Iowa, was known as the city that would never flood. Today, it is under 12 feet of water and, with more thunderstorms on the way, the worst could still be yet to come.

To give you some idea how secure the city fathers of Cedar Rapids felt about their safety, they constructed the City Hall, the county courthouse and the county jail on an island in the river. News photos reveal how completely inaccessible those buildings are today.

All of which reminds me of the Trinity River Corridor Project and the, to me, foolish plan to construct a tollway inside the levees. From what I understand, this idea still hasn't met with the approval of federal officials and I'm wondering whether the flooding in Cedar Rapids could have some influence on the feds' decision.