4 of 20: This Thursday, April 18, 2013 aerial photo provided by the U.S. Coast Guard shows the dam in Marseilles, Ill., after seven barges broke free from a tow and came to rest against the dam. Rapid currents from this week's heavy rainstorms are blamed for the incident. The Coast Guard says the dam sustained minor damage but there were no reports of breaches in the structure or surrounding levees. No one was injured. Authorities evacuated as many as 1,500 residents of the northern Illinois city. (AP Photo/Courtesy of the U.S. Coast Guard, Petty Officer 3rd Class John Schleicher) (AP Photo/ John Schleicher)

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