Severe traffic in Napa caused by downed power lines

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Downed power lines blocked several lanes in both directions early Wednesday on Highway 29 in Napa to cause severe traffic, authorities said.

The closure was reported just after 4 a.m. between Wine Country and Trower avenues, according to the Metropolitan Transportation Commission.

The two southbound lanes and one northbound lane were closed, leaving just one northbound lane open, according to the Napa County Sheriff’s Office.

There was no estimated time for when the lanes will reopen.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani