Rapidan Dam is a small hydroelectric structure with five gates seen in this photo.
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From the article, here's a file photo of what the Rapidan Dam looked like in happier times.
Caption: A view of the Rapidan Dam from 2022. Blue Earth County officials on Monday warned the dam was in "imminent failure condition" given the heavy rains and flooding on the Blue Earth River.
Photo: Hannah Yang/MPR News
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