(CNN) -- At least 200 structures have been destroyed and 1,100 damaged after a dam on an eastern Iowa lake failed, unleashing a torrent of floodwaters, a spokesman for the governor said Sunday. The Lake Delhi dam, about 45 miles north of Cedar Rapids, failed Saturday as a result of "massive rain -- a very unusually high amount this season," according to Jim Flansburg, communications director for Gov. Chet Culver. It was unclear how many of the structures impacted by the ensuing floodwaters were residential homes, Flansburg said. Culver planned to tour the affected areas Sunday afternoon, helping set sandbags out to stave off the rising Maquoketa River.
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It's unclear how many of the affected structures are residential homes
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The Lake Delhi dam failed Saturday as a result of heavy rainfall in the region
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Iowa Gov. Chet Culver will tour the affected region Sunday
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No injuries were reported in the flooding
Video on Saturday showed massive amounts of water violently gushing from the pool behind the dam into the @placeholder below.