OROVILLE, Calif. (AP) — The costs to repair the nation's tallest dam after a nearly catastrophic failure of the spillways will top $500 million, nearly double the original estimate of $275 million, a ...

OROVILLE, Calif. (KGO) -- A team of experts is warning of a "very significant risk" if the main spillway of a California dam is not operational again by the next rainy season. The warning is contained ...

Six months before rushing water ripped a huge hole in a channel that drains a Northern California reservoir, state inspectors said the concrete spillway was sound. As officials puzzle through how to ...

California water officials are relying on key hydrology tests being performed in Utah on a replica of the Oroville Dam spillway to pinpoint what repairs will work best at the tallest dam in the U.S ...

One year after the worst structural failures at a major U.S. dam in a generation, federal regulators who oversee California's half-century-old, towering Oroville Dam say they are looking hard at how ...

Crews working around the clock atop the crippled Oroville Dam have made progress repairing the damaged spillway, reducing the lake level by at least 8 feet overnight at a Northern California reservoir ...