State workers check on the flow of Oroville Dam’s battered main spillway in mid-March. A preliminary analysis by the U.S. Army Corps of Engineers cites the presence of substandard materials beneath portions of the spillway, problems with the underlying drainage system and other woes as possible causes of the spillway’s fracture.
State workers check on the flow of Oroville Dam’s battered main spillway in mid-March. A preliminary analysis by the U.S. Army Corps of Engineers cites the presence of substandard materials beneath portions of the spillway, problems with the underlying drainage system and other woes as possible causes of the spillway’s fracture. Hector Amezcua hamezcua@sacbee.com
State workers check on the flow of Oroville Dam’s battered main spillway in mid-March. A preliminary analysis by the U.S. Army Corps of Engineers cites the presence of substandard materials beneath portions of the spillway, problems with the underlying drainage system and other woes as possible causes of the spillway’s fracture. Hector Amezcua hamezcua@sacbee.com

What went wrong at Oroville Dam? Analysis points to drainage, problematic soils

April 25, 2017 7:29 PM

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  • See Oroville dam spillway shaping up as repairs continue and deadline looms

    Work to repair and reconstruct the main spillway at Oroville Dam has been under way since April 2017. By November 1, 2017, the main spillway at Lake Oroville is expected to be ready to handle releases of up to 100,000 cubic feet per second. When fully reconstructed, it's expected to handle 270,000 cfs, according to news reports. This video of the repair progress was posted October 17, 2017.