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With the Des Moines River flowing toward their finish line in downdown Des Moines, runners cross the start line on the Saylorville Dam at the outset of the 30th Dam to Dam 20K road race Saturday morning, May 30, 2009.  A record 7,000 registered runners participated in the nation's largest 20K road race.

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Copyright ©Christopher Gannon/The Des Moines Register