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Oroville Dam

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FILE - In this Feb. 28, 2017, file photo, construction crews clear rocks away from Oroville Dam's crippled spillway in Oroville, Calif. The sudden collapse of spillways at the nation's highest dam was unique because it came without warning, and the investigation into why that was is sure to change the way big dams are built and run around the world, an independent team searching for explanations into this winter's near-disaster at Oroville Dam says. (AP Photo/Rich Pedroncelli, File)

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Assemblyman James Gallagher, R-Yuba City, questions Bill Croyle, the acting director of the Department of Water Resources, about the damaged spillways of the Oroville Dam during an Assembly committee hearing Thursday, May 11, 2017, in Sacramento, Calif. Lawmakers cited emerging technical reports from two independent teams of experts on the Oroville Dam's two spillway's, citing concrete that was thinner than modern standards call for, cracks, tree roots that had blocked spillway drains and bedrock anchoring the dam that was far weaker then assumed as some of the reasons for the near collapse of the spillways that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Bill Croyle, center, the acting director of the Department of Water Resources, flanked by Resources Secretary John Laird, left, and consultant David Gutierrez, discusses the damaged spillways of the Oroville Dam during a joint Assembly committee hearing Thursday, May 11, 2017, in Sacramento, Calif. Lawmakers cited numerous factors emerging from technical reports done by two independent teams of experts on the Oroville Dam's two spillway's, that contributed to the near collapse of the spillways that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Bill Croyle, the acting director of the Department of Water Resources, flanked by Resources Secretary John Laird, left, discusses the damaged spillways of the Oroville Dam during a Assembly committee hearing Thursday, May 11, 2017, in Sacramento, Calif. Lawmakers cited numerous factors emerging from technical reports done by two independent teams of experts on the Oroville Dam's two spillway's, that contributed to the near collapse of the spillways that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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State Sen. Jim Nielsen, R-Gerber, right, questions Bill Croyle, acting director of the Department of Water Resources, about the damage to the spillway of the Oroville Dam, during a hearing of the Senate Natural Resources and Water Committee, Tuesday, April 25, 2017, in Sacramento, Calif. Croyle and Natural Resources Secretary John Laird, updated lawmakers on the actions taken to repair the damaged spillway that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Natural Resources Secretary John Laird, right, discusses the damaged spillway on the Oroville Dam during a hearing of the Senate Committee on Natural Resources and Water, Tuesday, April 25, 2017, in Sacramento, Calif. Laird, and Bill Croyle, left, the acting director of the Department of Water Resources, updated lawmakers on the actions taken to repair the damaged spillway that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Bill Croyle, left, the acting director of the Department of Water Resources, discusses the damaged spillway on the Oroville Dam during a hearing of the Senate of the Natural Resources and Water Committee, Tuesday, April 25, 2017, in Sacramento, Calif. Croyle and Natural Resources Secretary John Laird, right, updated lawmakers on the actions taken to repair the damaged spillway that caused the evacuation of nearly 200,000 people downstream of the Oroville Dam in February. (AP Photo/Rich Pedroncelli)

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Water gushes from the Oroville Dam's main spillway Tuesday, Feb. 14, 2017, in Oroville, Calif. Crews working around the clock atop the crippled Oroville Dam have made progress repairing the damaged spillway, state officials said Tuesday. (AP Photo/Marcio Jose Sanchez)

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Water gushes from the Oroville Dam's main spillway Tuesday, Feb. 14, 2017, in Oroville, Calif. Crews working around the clock atop the crippled Oroville Dam have made progress repairing the damaged spillway, state officials said Tuesday. (AP Photo/Marcio Jose Sanchez)

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A helicopter sits at a staging area behind bags of rocks near the Oroville Dam, Monday, Feb. 13, 2017, in Oroville, Calif. Officials from the California Department of Water Resources were considering using helicopters to drop loads of rock on the eroded spillway at Lake Oroville. (AP Photo/Rich Pedroncelli)

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This photo shows the emergency spillway at the Oroville Dam shortly early Monday, Feb. 13, 2017, in Oroville, Calif. Water levels at Lake Oroville are continuing to drop Monday and stopping water from spilling over the spillway. Evacuations for people living below the lake were ordered Sunday after authorities warned the emergency spillway of the Oroville Dam could fail at any time unleashing uncontrolled flood waters on towns below. (AP Photo/Rich Pedroncelli)

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In this Saturday, Feb. 11, 2017, photo, Jason Newton, of the Department of Water Resources, takes a picture of water going over the emergency spillway at Oroville Dam in Oroville, Calif. Officials have ordered residents near the Oroville Dam in Northern California to evacuate the area Sunday, Feb. 12, saying a "hazardous situation is developing" after an emergency spillway severely eroded. (AP Photo/Rich Pedroncelli)

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This Friday, Feb. 10, 2017 image from video provided by the office of Assemblyman Brian Dahle shows water flowing over an emergency spillway of the Oroville Dam in Oroville, Calif., during a helicopter tour by the Butte County Sheriff's office. About 150 miles northeast of San Francisco, Lake Oroville is one of California’s largest man-made lakes, and the 770-foot-tall Oroville Dam is the nation's tallest. (Josh F.W. Cook/Office of Assemblyman Brian Dahle via AP)

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This Friday, Feb. 10, 2017 image from video provided by the office of Assemblyman Brian Dahle shows water flowing over an emergency spillway of the Oroville Dam in Oroville, Calif., during a helicopter tour by the Butte County Sheriff's office. About 150 miles northeast of San Francisco, Lake Oroville is one of California’s largest man-made lakes, and the 770-foot-tall Oroville Dam is the nation's tallest. (Josh F.W. Cook/Office of Assemblyman Brian Dahle via AP)