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Wednesday, March 1, 2017

Dam security

Dramatic new images show scale of damage to Oroville Dam spillway 

Story image for oroville from Sacramento BeeGeologists attempted for the first time Tuesday to figure out what to do about the vast, yawning canyon dug out of the earth after a crater opened up in the Oroville Dam’s concrete spillway and diverted water at high speed into the adjacent hillside.
Monday’s shutoff of water flowing down the main spillway revealed a shocking panorama of damage, forcing experts with the California Department of Water Resources to scramble to figure out how the crippled chute can possibly be fixed by the end of the year — in time for the next rainy season.
Photographs and video released by the department Tuesday showed that an enormous section of the spillway, which is as wide as a 15-lane freeway, had been wiped out. In its place is a giant rocky channel carved out of the earth leading down to the Feather River.
  • Riverbend Park is seen under flood water in Oroville, California on February 13, 2017. Almost 200,000 people were under evacuation orders in northern California Monday after a threat of catastrophic failure at the United States' tallest dam. Officials said the threat had subsided for the moment as water levels at the Oroville Dam, 75 miles north of Sacramento, have eased. But people were still being told to stay out of the area.
  • The Oroville Dam’s concrete spillway needs major repairs after an enormous section of the channel was ruined in recent rains.

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