Emergency release of water from Oroville Dam escalates

As reported by the San Francisco Chronicle:

As water Thursday night rose toward the brim of the reservoir behind the damaged spillway of Oroville Dam, state officials braced for the unprecedented: having to open the emergency outlet of the tallest dam in the United States, which could have untold ecological consequences.

The trouble started Tuesday in the midst of relentless rainstorms, as a section of the concrete spillway that later grew to more than 200 feet wide and 30 feet deep collapsed, frothing the Feather River below like chocolate syrup, so thick with mud and debris that those toiling to save millions of salmon at the hatchery below could hardly see two inches beneath the surface.

Officials stopped releases to inspect the problem but runoff kept the reservoir rising. On Thursday morning, officials increased the flow. The fissure ballooned outward, sending coffee-colored water gushing down the adjacent hillside. …

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