Disaster_Accident

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Brannan Ramirez, of Oroville, Calif., waits at an evacuation center in Chico, Calif., after being evacuated from areas downstream of the Oroville Dam, Monday, Feb. 13, 2017. People who were ordered to leave their homes out of fear that a dam spillway could collapse may not be able to return until the barrier at the dam is repaired, a sheriff said Monday. (AP Photo/Don Thompson)

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CORRECTS DATE TO MONDAY FEB 13, NOT 12 - Water continues to run down the main spillway at Lake Oroville 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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The water from the Feather River flows through Oroville, Calif., Monday, Feb. 13, 2017. Water levels at Lake Oroville, which feeds the river are continuing to drop, stopping water from spilling over the spillway. 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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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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In this Saturday, Feb. 11, 2017, photo, floodwaters run down a street in Worland, Wyo. Troops, firefighters and residents stacked sandbags Monday, Feb.13, along the Bighorn River after it jumped its banks over the weekend and forced the evacuation of more than 100 homes and businesses in Wyoming. (Karla Pomeroy/Northern Wyoming Daily News via AP)

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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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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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Todd Remocal of Biggs, Calif., eats breakfast on the hood of his truck at the Silver Dollar Fairgrounds on Monday, Feb. 13, 2017, in Chico, Calif. He and his wife Kelly slept in their vehicle with their three dogs last night after residents were evacuated from the area due to fears of a possible failure of the emergency spillway at the Oroville Dam.(Paul Kitagaki Jr./The Sacramento Bee via AP)

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Luke Acosta, 14, and his dog, Skinny, slept in the back of his family's pickup truck lat night at the Silver Dollar Fairgrounds on Monday, Feb. 13, 2017, in Chico, Calif., after residents were evacuated from the area due to fears of a possible failure of the emergency spillway at the Oroville Dam. 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, reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of nearly 200,000 people downstream.(Paul Kitagaki Jr./The Sacramento Bee via AP)

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Paula Gillock, 53, waits in line for breakfast at the Silver Dollar Fairground on Monday, Feb. 13, 2017, in Chico, Calif., after residents were evacuated from the possible failure of the emergency spillway at the Oroville Dam. 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, reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of nearly 200,000 people downstream.(Paul Kitagaki Jr./The Sacramento Bee via AP)

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Paula Gillock, 53, waits in line for breakfast at the Silver Dollar Fairground on Monday, Feb. 13, 2017, in Chico, Calif. She left her home in Gridley and slept in her car with her cat Mimi after residents were evacuated from the possible failure of the emergency spillway at the Oroville Dam. 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, reducing the risk of a catastrophic spillway collapse and easing fears that prompted the evacuation of nearly 200,000 people downstream.(Paul Kitagaki Jr./The Sacramento Bee via AP)

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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)