[EarthResearcher333]

Construction photos of the building of the "Cutoff Wall". Removable forms are being used to create concrete side structures. The wall will be cut deeper within this zone to get to competent rock. Apparently, this location, 700 feet down from the ES Weir, had closer to the surface rock to facilitate a shorter wall height.

[abb]

File for reference

http://www.water.ca.gov/news/newsreleases/2017/041717_oro_contract_award.pdf

April 17, 2017
DWR Awards Contract for Oroville Spillways Repair
SACRAMENTO
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Details of the three bids will not be made public, as they contain design information that is considered Critical Energy/Electric Infrastructure Information by federal regulators and could cause a security risk if released.