Detailed text transcripts for TV channel - KGO - 20140108:10:50:00
Twice a day like clockwork, something strange happens. at high tide, the bay spills back into the mouth of the river against the current. a huge wave shoots back up the river for miles. a tidal bore. a phenomenon that happens only a few places on earth. >> the bore was famous back in the day. like sweep boats away. and in the '60s they built this dam and stopped the flow and the river turned into a stream that you could literally throw a rock across. >> reporter: shallow, clogged with silt and polluted, the water is now dark brown, like a chocolate river. >> something like a willy wonka fantas...
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