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This is a non power producing roller dam in South Bend Indiana.  It's to prevent erosion of the river banks.  There is also a fish ladder and a monitoring point for DNR agents to study the fish.
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<bdo lang="en" dir="ltr"><a href="//commons.wikimedia.org/wiki/Commons:YouTube_files" title="Commons:YouTube files">YouTube</a>: <a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=D3ggyhA2IH4"><bdi lang="">South Bend Indiana Dam</bdi></a> – View/save archived versions on <a rel="nofollow" class="external text" href="https://web.archive.org/web/*/https://www.youtube.com/watch?v=D3ggyhA2IH4">archive.org</a> and <a rel="nofollow" class="external text" href="https://archive.today/https://www.youtube.com/watch?v=D3ggyhA2IH4">archive.today</a></bdo>