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World's Toughest Fixes: Columbia River Dam

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World's Toughest Fixes: Columbia River Dam
Riley heads to Portland, Ore, where a fault in the John Day Dam is stopping cargo traffic in its tracks. Here, on the Columbia River, water levels are regulated by a series of gates, allowing cargo vessels and other watercraft to pass through the dams with ease. But a broken lock on one of the gates has thrown a serious kink into traffic flow and that needs to change -- fast.

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