America’s $4tn infrastructure time bomb – BBC News

America’s $4tn infrastructure time bomb

On the banks of California’s Feather River, way below the tallest dam in the United States, is a ballet of steel and stone. The dancers are huge earth-moving machines, their costumes bright yellow.

The movement is constant and mesmerising. The lorries trundle down to the water from the left, pause to accept their loads of rock, mud and debris, and then exit to the right.

For weeks now this performance has been constant, day and night, as construction workers repair the Oroville Dam, once an engineering marvel, now an embarrassment.

Last month, nearly 200,000 people were told to leave their homes when the dam overflowed amid fears that water pouring over a weakened emergency spillway was eroding the hillside beneath the structure.

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