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FILE - In this Tuesday, Feb. 21, 2017 file photo, heavy storms over the past two weeks caused parts of the shoulder and one lane of westbound Highway 50 give way near Pollock Pines, Calif. The hole is about 40 feet long and 17 feet wide on one of the main routes to Lake Tahoe. (AP Photo/Rich Pedroncelli)

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FILE - In this April 22, 2014 file photo, highway repair work causes drivers entering Sacramento on eastbound Highway 50 to come to a near standstill as traffic backs up in West Sacramento, Calif. Improving the nation’s roads and bridges would require $120 billion a year through 2020, according to a recent U.S. Department of Transportation estimate. But annual spending at all levels of government is just $88 billion. And the nation's mass transit systems have over a $90 billion backlog of maintenance and repair needs. (AP Photo/Rich Pedroncelli, File)

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In this March 24, 2017 photo, the bark of a giant European Beech tree bears the markings of a carved heart in Portsmouth, N.H. A New Hampshire program encourages residents to search their city's streets, backyards and woods for the state's largest trees. (AP Photo/Michael Casey)

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In this March 24, 2017 photo, a horse chestnut tree that dates back to 1776 towers over the historic Moffatt-Ladd house in Portsmouth, N.H. A new state program encourages residents to search their city's streets, backyards and woods for the state's largest trees. (AP Photo/Michael Casey)

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In this March 24, 2017 photo, Kevin Martin, state coordinator for New Hampshire's Big Tree Program, is dwarfed by the giant a European Beech tree he is measuring in Portsmouth, N.H. The program encourages residents to search their city's streets, backyards and woods for the state's largest trees. (AP Photo/Michael Casey)

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In this March 24, 2017 photo, Kevin Martin, state coordinator for New Hampshire's Big Tree Program, measures the circumference of a European Beech tree in Portsmouth, N.H. The program encourages residents to search their city's streets, backyards and woods for the state's largest trees. (AP Photo/Michael Casey)

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Woodcarver Dean Hurliman has turned his attention to carving exotic and endangered birds such as the Carolina parakeet, shown here on Monday, March 27, 2017 at his his home in rural Burlington, Iowa. (Ben Roberts/The Hawk Eye via AP)

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FILE - In this file photo made from the footage taken from Russian Defense Ministry official web site Friday, April 7, 2017, an aerial view shows shelters for aircraft at a Syrian airbase after it was hit by US strike in Syria. A U.S. missile attack on Friday, April 7, 2017 has caused heavy damage to one of Syria's biggest and most strategic air bases, used to launch warplanes to strike opposition-held areas in central, northern and southern Syria. (Russian Defense Ministry Press Service Photo via AP, File)

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Emergency personnel and news crews survey a damaged road in the aftermath of a mudslide Friday, April 7, 2017, in Oakland , Calif. Heavy rains softened already saturated grounds and caused a landslide in the Oakland hills, while high gusts of wind Friday morning left thousands without power in the San Francisco Bay Area. (AP Photo/Marcio Jose Sanchez)

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Workers survey a backyard damaged by a mudslide Friday, April 7, 2017, in Oakland , Calif. Heavy rains softened already saturated grounds and caused a landslide in the Oakland hills, while high gusts of wind Friday morning left thousands without power in the San Francisco Bay Area. (AP Photo/Marcio Jose Sanchez)

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A landslide on Aitken Ave., from an overnight storm threatens homes Friday, April 7, 2017, in Oakland, Calif. Several homes were evacuated overnight during a heavy storm. Officials say heavy rains and high gusts of wind softened already saturated grounds and caused a landslide in the Oakland hills. Residents in at least six homes were forced to evacuate Thursday night. Crews were evaluating the situation Friday. (Gary Reyes/Bay Area News Group via AP)

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Boulders and debris surround homes on Tuesday, April 4, 2017, after rivers surrounding Mocoa, Colombia overflowed and sent a wall of water and debris surging through the city over the weekend. Authorities said hundreds were killed. (AP Photo/Fernando Vergara)

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FILE - This Jan. 9, 2017 file photo shows flooded vineyards in the Russian River Valley in Forestville, Calif. On Friday, April 7, 2017, California Gov. Jerry Brown declared an end to the state's water emergency following a five-year drought that reduced rivers to trickles, farmland to dust fields and forests to swathes of dead trees. Storms hit in 2015 and returned with a vengeance last year, filling reservoirs, overflowing dams, swelling creeks and pumping up the snowpack. (AP Photo/Eric Risberg, File)

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FILE - In this Jan. 9, 2014 file photo, children walk on rocks that are normally on the shore of Folsom Lake, Calif., a reservoir that at the time had receded more than 100 yards. On Friday, April 7, 2017, California Gov. Jerry Brown declared an end to the state's water emergency following a five-year drought that reduced rivers to trickles, farmland to dust fields and forests to swathes of dead trees. Storms hit in 2015 and returned with a vengeance in 2016 and in early 2017, filling reservoirs, overflowing dams, swelling creeks and pumping up the snowpack. (AP Photo/Rich Pedroncelli, File)

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FILE - In this Friday, June 5, 2015 file photo, Tony Corcoran records sprinklers watering the lawn at a house in Beverly Hills, Calif., a practice that became known as "drought shaming." On Friday, April 7, 2017 California Gov. Jerry Brown declared an end to the state's water emergency following a five-year drought that reduced rivers to trickles, farmland to dust fields and forests to swathes of dead trees. At the peak of the drought, the state called for a mandatory 25 percent cut in urban water use compared with 2013 levels. (AP Photo/Jae C. Hong, File)

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FILE - This July 8, 2014 file photo shows a sign alerting visitors to water conservation efforts at the state Capitol in Sacramento, Calif. On Friday, April 7, 2017, California Gov. Jerry Brown declared an end to the state's water emergency following a five-year drought that reduced rivers to trickles, farmland to dust fields and forests to swathes of dead trees. At the peak of the drought, the state urged Californians to slash their water use, and led by example by letting the Capitol lawn die. (AP Photo/Rich Pedroncelli, File)

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FILE - This May 18, 2015 file photo shows irrigation pipes along a dry irrigation canal on a field near Stockton, Calif. On Friday, April 7, 2017, California Gov. Jerry Brown declared an end to the state's water emergency following a five-year drought that reduced rivers to trickles, farmland to dust fields and forests to swathes of dead trees. The state's $47 billion farming industry took a hit as government-supplied irrigation supplies were drastically reduced. Farmers dug more wells, sucking up groundwater in the Central Valley and causing the ground to sink. (AP Photo/Rich Pedroncelli, File)

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Assistant Commandant of the Marine Corps Gen. Glenn Walters speaks during an interview, Friday, April 7, 2017, at the Pentagon. Two male Marines have been demoted and about two dozen other military members are being investigated in connection with the investigation into nude photographs that were shared online, the Marine Corps said Friday. (AP Photo/Evan Vucci)

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FILE - In this Jan. 3, 2017 file photo, Joe Johnson clears snow from a neighbor's driveway near Kyburz, Calif. Calif. Gov. Jerry Brown declared an end to California's historic drought Friday, April 7, 2017, lifting emergency orders that had forced residents to stop running sprinklers as often and encouraged them to rip out thirsty lawns during the state's driest four-year period on record. (AP Photo/Rich Pedroncelli, File)

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FILE - In this Thursday, Oct. 30, 2014 file photo, houseboats sit in the drought lowered waters of Oroville Lake, near Oroville, Calif. Gov. Jerry Brown declared an end to California's historic drought Friday, April 7, 2017, lifting emergency orders that had forced residents to stop running sprinklers as often and encouraged them to rip out thirsty lawns during the state's driest four-year period on record. (AP Photo/Rich Pedroncelli, File)