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Report: Green Spot Not A Risk To Oroville Dam Safety

  •  Amy Quinton 
Wednesday, August 30, 2017 | Sacramento, CA
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Department of Water Resources
 

Department of Water Resources

The independent Board of Consultants agreed with the California Department of Water Resources that the vegetative green spot that appears across the face of the earthen Oroville dam is caused by temporarily trapped rainwater. The report finds the spot poses no threat to public safety.

0830AQ_greenspotcropped

View of vegetation on the downstream face of Oroville Dam. Taken on March 9, 2011 near the end of the rain season. Photo / California Department of Water Resources.

The area was first noticed during construction in 1966, before the reservoir was filled. But after the Oroville dam spillway failed in February, some feared the spot suggested the dam was also at risk.

The Board's report finds that seepage measurements at the base of the 770 foot dam have remained consistently low. The California Department of Water Resources says the vegetation dries out during the summer months, which it would not do if it had a constant source of seepage.


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    More about Oroville Dam

  • Oroville Dam

 water resourcesCalifornia Department of Water ResourcesOroville Damdamsdam safety

Amy Quinton

Former Environment Reporter

Amy came to Sacramento from New Hampshire Public Radio (NHPR) where she was Environment Reporter. Amy has also reported for NPR member stations WFAE in Charlotte, WAMU in Washington D.C. and American Public Media's "Marketplace."  Read Full Bio 

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