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Scott Cahill: Collapse Risk At The Oroville Dam Is Still Unacceptably High

August 22, 2017

Scott Cahill: Collapse Risk At The Oroville Dam Is Still Unacceptably High

Bungled repairs and new concerns at the tallest US dam

Remember the crisis earlier this year at the Oroville Dam?

The overflow from California’s winter of heavy rain threatened to overpower our country’s tallest dam. A cascading failure of the dam’s main gates, its primarily spillway AND its emergency spillway had the world watching hour by hour to see if a catastrophic breach was going to occur.

Fortunately, the rains stopped long enough for the situation to be brought under control. The dam remains in place and repair crews have been working all spring and summer.

But should we breathe easy at this point? Not at all, says dam safety expert Scott Cahill. Our readers will remember Scott from the excellent technical assessment he provided in the thick of the crisis earlier this year. In our earlier podcast with him, he explained how the real tragedy at Oroville was that for many years, small and affordable maintenance projects that easily could have prevented the crisis were diverted (in his estimation, the cost of making the needed repairs was quite small — around $6 million. But for short-sighted reasons, the repairs were not funded; and now the bill to fix the resultant damage will likely be on the order of magnitude of over $200 million. Which does not factor in the environmental carnage caused by flooding downstream ecosystems with high-sediment water or the costs involved with evacuating the 200,000 residents living nearby the dam).

And the pattern appears to be continuing. In this week’s podcast, Scott details a number of concerning structural risks visible at Oroville that are again being de-prioritized, or ignored all-together. And as before, straightforward and inexpensive projects that have high potential to prevent a catastrophic failure of the dam are not being pursued:

…click on the above link to read the rest of the article…

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