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This photo shows erosion caused when overflow water cascaded down the emergency spillway of Oroville Dam, Monday, Feb. 13, 2017, in Oroville, Calif. Water levels dropped Monday at the nation's tallest dam, easing slightly the fears of a catastrophic spillway collapse that prompted authorities to order people to leave their homes downstream. (AP Photo/Rich Pedroncelli)

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This photo shows erosion caused when overflow water cascaded down the emergency spillway of Oroville Dam, Monday, Feb. 13, 2017, in Oroville, Calif. Water levels dropped Monday at the nation's tallest dam, easing slightly the fears of a catastrophic spillway collapse that prompted authorities to order people to leave their homes downstream. At upper left, water flows down the dams main spillway. (AP Photo/Rich Pedroncelli)

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Erosion caused when overflow water cascaded down the emergency spillway is seen, bottom, as water continues to flow down the main spillway, top, of the Oroville Dam, Monday, Feb. 13, 2017, in Oroville, Calif. The water level dropped Monday at the nation's tallest dam, easing slightly the fears of a catastrophic spillway collapse that prompted authorities to order people to leave their homes downstream. (AP Photo/Rich Pedroncelli)

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A pair of helicopters come in for a landing at a staging area near the Oroville Dam, Monday, Feb. 13, 2017, in Oroville, Calif. State officials have discussed using helicopters to drop loads of rock on the damaged emergency spillway of the dam. (AP Photo/Rich Pedroncelli)

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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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Construction equipment moves piles of rock at a staging area near the Oroville Dam, Monday, Feb. 13, 2017, in Oroville, Calif. State officials have discussed using helicopters to drop loads of rock on the damaged emergency spillway of the dam. (AP Photo/Rich Pedroncelli)

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Cheyenne River Sioux Chairman Harold Frazier, center, and Madonna Thunder Hawk, left, of the Oohenumpa band of the Cheyenne River Sioux Tribe, wait to speak to reporters outside federal court in Washington, Monday, Feb. 13, 2017. A judge has rejected a request by two American Indian tribes to halt construction of the remaining section of the Dakota Access oil pipeline until their lawsuit over the project is resolved. (AP Photo/Susan Walsh)

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FILE - In this file photo taken Thursday, Oct. 30, 2014, houseboats sit in the drought lowered waters of Oroville Lake, near Oroville, Calif. Water levels dropped Monday, Feb. 13, 2017, at California's Lake Oroville, stopping water from spilling over a massive dam's potentially hazardous emergency spillway after authorities ordered the evacuation of people from towns lying below the lake. Lake Oroville also serves as a reservoir and levels rose significantly in recent weeks after a series of storms that have dumped rain and snow across California. (AP Photo/Rich Pedroncelli, File)

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This photo shows erosion caused when overflow water cascaded down the emergency spillway of the Oroville Dam, Monday, Feb. 13, 2017, in Oroville, Calif. The water level dropped Monday at the nation's tallest dam, easing slightly the fears of a catastrophic spillway collapse that prompted authorities to order people to leave their homes downstream. (AP Photo/Rich Pedroncelli)

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A helicopter kicks up dust as it lands at a staging area near the Oroville Dam on Monday, Feb. 13, 2017, in Oroville, Calif. State officials have discussed using helicopters to drop loads of rock on the damaged emergency spillway of the dam. (AP Photo/Rich Pedroncelli)

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In an aerial photo, workers load bags with rocks at the dam overlook area on Monday, Feb. 13, 2017, in Oroville, Calif. The water level dropped Monday behind the nation's tallest dam, reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of nearly 200,000 people downstream. Sunday afternoon's evacuation order came after engineers spotted a hole on the concrete lip of the secondary spillway for the 770-foot-tall Oroville Dam and told authorities that it could fail within the hour. (Randy Pench/The Sacramento Bee via AP)

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In an aerial photo, the emergency spillway at Lake Oroville shows signs of damage from the water which spilled over recently, on Monday, Feb. 13, 2017, in Oroville, Calif. Sunday afternoon's evacuation order came after engineers spotted a hole on the concrete lip of the secondary spillway for the 770-foot-tall Oroville Dam and told authorities that it could fail within the hour. The water level dropped Monday behind the nation's tallest dam, reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of nearly 200,000 people downstream. (Randy Pench/The Sacramento Bee via AP)

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In an aerial photo, the emergency spillway at Lake Oroville shows signs of damage from the water which spilled over recently, on Monday, Feb. 13, 2017, in Oroville, Calif. Sunday afternoon's evacuation order came after engineers spotted a hole on the concrete lip of the secondary spillway for the 770-foot-tall Oroville Dam and told authorities that it could fail within the hour. The water level dropped Monday behind the nation's tallest dam, reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of nearly 200,000 people downstream. (Randy Pench/The Sacramento Bee via AP)

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Oroville, Calif., resident Patrick Cumings, left, holds his daughter, Elizabeth, and he stands with his wife, Elizabeth Cumings at the Red Cross evacuation center in Chico, Calif., Monday, Feb. 13, 2017. The water level has dropped behind the Oroville Dam, nation's tallest dam, in Oroville reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of the Cumings and others downstream. (AP Photo/Don Thompson)

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Water continues to run down the main spillway at Lake Oroville on Monday, Feb. 12, 2017, in Oroville, Calif. The water level dropped Monday behind the nation's tallest dam, reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of nearly 200,000 people downstream. Sunday afternoon's evacuation order came after engineers spotted a hole on the concrete lip of the secondary spillway for the 770-foot-tall Oroville Dam and told authorities that it could fail within the hour. (Randy Pench/The Sacramento Bee via AP)

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Barcelona's Luis Suarez, left, and Lionel Messi attend a training session at Parc des Princes stadium at the eve of the Champions League soccer match between Paris Saint Germain and Barcelona at the Parc des Princes stadium in Paris, Monday, Feb. 13, 2017. (AP Photo/Michel Euler)

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Barcelona's Lionel Messi attends a training session at Parc des Princes stadium at the eve of the Champions League soccer match between Paris Saint Germain and Barcelona at the Parc des Princes stadium in Paris, Monday, Feb. 13, 2017. (AP Photo/Michel Euler)

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FILE - In this Feb. 12, 2014, file photo, cars lie in a sinkhole that opened up at the Skydome showroom in the National Corvette Museum in Bowling Green, Ky. The museum said a prized Corvette still covered in dirt and debris from its 2014 fall into the sinkhole has been moved from display to undergo repairs. The museum said the restoration work on the 1962 Corvette will be done at the museum and visitors will be able to watch the progress in restoring the car. (AP Photo/Michael Noble Jr., File)

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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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Lake water flows over the emergency spillway, bottom left, at Lake Oroville for the first time in the nearly 50-year history of the Oroville Dam Saturday, Feb. 11, 2017, in Oroville, Calif. The dam opened in 1968. (Randy Pench/The Sacramento Bee via AP)