UPDATE, 10:17 a.m.: All clear, says KHUM listener @GregGehr.
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UPDATE: A small number of PG&E customers appear to have lost power in the incident.
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According to the CHP, a big rig took out power lines on 299 near the exit off 101 at around 9:30 this morning. The lines are across the roadway. PG&E and the Dept. of Transportation have been called out. Avoid the area if possible.