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The Iowa DNR is responsible for the state's dam safety program. The program involves the review and approval for the construction of new dams, maintaining an inventory of existing dams that meet minimum size criteria and the periodic inspection of certain dams. Currently there are approximately 3300 dams on the state's dam inventory. Dams that have the potential to create extensive damage to downstream houses or buildings, or to cause loss of life should they fail and release their impounded water are required to be regularly inspected. There are currently 227 dams that require regular inspections. Of those, 74 dams are required to be inspected at least once every two years and the remaining 153 dams have a five year inspection frequency.
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