AMERICAN CANYON (CBS SF) — A big-rig carrying a trailer with roughly 60,000 pounds of construction debris crashed, knocking down utility lines and spilling half its load along state Highway 29 in American Canyon this morning, according to police.

The crash occurred in the northbound lanes just north of Paoli Loop Road at 9:08 a.m., according to American Canyon police Chief Tracey Stuart.

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The big-rig driver drifted toward the center median, then overcorrected and tipped the vehicle over, Stuart said.

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A utility pole was also damaged, leaving AT&T lines down along the roadway, according to Stuart.

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The incident closed one of the roadways two northbound lanes for hours, but as of 3:49 p.m. the Napa County Sheriff’s Office said via Twitter that both lanes had reopened.