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Evacuees rest at a shelter for residents of cities surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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In this Monday, Feb. 13, 2017 photo, Butte County Sheriff Kory Honea talks about the mandatory evacuations during a press conference in Oroville, Calif. Officials have ordered residents near the Oroville Dam in Northern California to evacuate the area, saying a "hazardous situation is developing" after an emergency spillway severely eroded. (Bill Husa/The Chico Enterprise-Record via AP)

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In this Monday Feb. 13, 2017 photo, mist forms as water flows down Oroville Dam's main spillway near 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. (Bill Husa/The Chico Enterprise-Record via AP)

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In this Monday, Feb. 13, 2017 photo, Montgomery Street is empty of traffic in Oroville, Calif. Officials have ordered residents near the Oroville Dam in Northern California to evacuate the area the day before, saying a "hazardous situation is developing" after an emergency spillway severely eroded (Bill Husa/The Chico Enterprise-Record via AP)

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Delores Dearte, right, and Merna Thompson, neighbors from the town of Gridley, Calif., rest at a shelter for evacuees from cities surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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Jace Duran, 4, of Oroville, Calif., at left, waits in line for a meal at a shelter for evacuees from cities surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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Sonya Warrick, of Oroville, Calif., rests at a shelter for evacuees from cities surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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People line up for a meal at a shelter for evacuees from cities surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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Katherine Boeger Knight, left, plays a card game with her daughter Amethyst, 5, at a shelter for evacuees from cities surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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Bea Noelle De Leon, 11, of Oroville, Calif., checks her phone at a shelter for evacuees from cities surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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Evacuees from city's surrounding the Oroville Dam line up for dinner at a shelter Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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Jace Lawson, 1, of Oroville, Calif., bottom, sleeps as people behind wait for a meal at a shelter for evacuees from city's surrounding the Oroville Dam, Monday, Feb. 13, 2017, in Chico, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (AP Photo/Marcio Jose Sanchez)

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Evacuee Lisa Nelson, right, relaxes with her dog at an emergency shelter set up at the Sutter High School gymnasium on Monday, Feb. 13, 2017, in Sutter, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (Chris Kaufman/The Appeal-Democrat via AP)

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Evacuees seek high ground Monday, Feb. 13, 2017, in Sutter, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (Chris Kaufman/The Appeal-Democrat via AP)

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A sign warns area residents about evacuating as motorists try to get gas at one of the few stations open Monday, Feb. 13, 2017, in Oroville, Calif. Thousands of Northern California residents were asked to evacuate their homes Sunday evening 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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Oroville Dam Boulevard is seen with no traffic in sight after an evacuation order under threat from spillage from the dam in Oroville, Calif., Monday, Feb. 13, 2017. Helicopters dropped giant rock-filled sandbags into place Monday to shore up the California reservoir that had threatened to breach its banks and unleash a 30-foot wall of water, but officials said the evacuation order would stay in place until they are sure it's safe to return home. (AP Photo/Marcio Jose Sanchez)

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A man walks past an evacuated gas station after an evacuation order under threat from spillage from the Oroville Dam in Oroville, Calif., Monday, Feb. 13, 2017. Helicopters dropped giant rock-filled sandbags into place Monday to shore up the California reservoir that had threatened to breach its banks and unleash a 30-foot wall of water, but officials said the evacuation order would stay in place until they are sure it's safe to return home. (AP Photo/Marcio Jose Sanchez)

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Alejandra Ramirez, front center, paints her nails as her cousin Joyce Garcia looks on at a makeshift campsite Monday, Feb. 13, 2017, in Sutter, Calif. The thousands of people who were ordered to leave their homes after a damaged California spillway threatened to unleash a 30-foot wall of water may not be able to return until significant erosion is repaired, authorities said Monday. (Chris Kaufman/The Appeal-Democrat via AP)

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A truck loaded with rocks arrives at the staging area as a helicopter takes off with a bag filled with rocks to be dropped on a hole on the lip of the Oroville Dam's emergency spillway Monday Feb., 13, 2017, in Oroville, Calif. The barrier, at the nation's tallest dam, is being repaired a day after authorities ordered mass evacuations for everyone living below the lake out of concerns the spillway could fail. (AP Photo/Rich Pedroncelli)

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A helicopter flies over Oroville Dam's main spillway to drop a bag of rocks that will be placed on a hole on the lip of the emergency spillway Monday, Feb. 13, 2017, in Oroville, Calif. The barrier, at the nation's tallest dam, is being repaired a day after authorities ordered mass evacuations for everyone living below the lake out of concerns the spillway could fail and send a 30-foot wall of water roaring downstream. (AP Photo/Rich Pedroncelli)