Great Lakes shorelines have seen a surge in barriers built to slow lakefront erosion. But such structures are temporary and may harm downstream beaches. This story is part of the series "Imperiled Shores." Reporting by Mario Koran. Originally published Oct. 30, 2021. Narration by Wesley Lethem.

Great Lakes shorelines have seen a surge in barriers built to slow lakefront erosion. But such structures are temporary and may harm downstream beaches. This story is part of the series "Imperiled Shores." Reporting by Mario Koran. Originally published Oct. 30, 2021. Narration by Wesley Lethem.

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