PORTLAND, Ore. (AP) — A major highway linking California and Oregon fully reopened late Wednesday, nearly 24 hours after a major storm blew in off the Pacific Ocean and slammed the region with heavy snow, gale-force winds and drenching rain.

Hundreds of cars spun out in blizzard conditions where Interstate 5 traverses high mountain passes between Oregon and California and some travelers were stranded for 17 hours or more and slept in their vehicles. The situation made it difficult for plows to clear the freeway, which was closed in both directions late Tuesday because of the storm.

Southbound lanes reopened at Ashland, Oregon early Wednesday and the northbound lanes reopened late Wednesday. Chains were no longer required, authorities said.

Travel during the storm was particularly perilous over the Siskiyou Summit, one of the more treacherous mountain passes, and just south of the Oregon-California state line.

“There is a large number of spun out vehicles, large trucks and smaller cars, along the road that didn’t put chains in their tires as required,” Denise Yergenson, a Caltrans spokeswoman said earlier. “That blocked the road and it’s hampering our ability to plow.”

Don Anderson, deputy director of the California Department of Transportation in Redding, said Caltrans and many other agencies worked hard to communicate the seriousness of the storm but that many drivers were still caught by surprise.

“You must use your chains when directed to do so. Of all the trucks and vehicles that spun out nearly all did not put on their chains as they were required to do,” he said in a statement.

Portland, Oregon resident Christina Williams and her 13-year-old son were some of the lucky ones who made it through the storm, but not without plenty of scary moments. They were driving from Oregon to the San Francisco area for Thanksgiving when they first hit snow around Roseburg, Oregon.

Williams said it took them more than 17 hours to reach Redding, California, where they got a hotel room. Conditions were so treacherous, she said, that she was afraid to try to exit the freeway because it was so slippery.

Cars all around them were getting stranded and ice formed on her windshield even while the car was on.

"There were spin-outs everywhere, there were trucks that were abandoned and every time we stopped and started moving again, there were people who couldn't start moving again," Williams said. "Every time we stopped I was like, is this it? Are we going to be here overnight?"

At the peak of the storm, Pacific Power said 19,000 customers were without power in Northern California and Southern Oregon. As of late Wednesday morning the company said that number was down to about 1,700.

The storm — called a “bomb cyclone” — came ashore near Brookings, Oregon late Tuesday afternoon packing heavy snow and winds gusting up to 106 mph (170 kmh) in some coastal areas. A bomb cyclone forms when air pressure drops 24 millibars or more in a 24-hour period. They are rare in the U.S. West and this storm’s pressure dropped even more precipitously than expected, leading forecasters to say it was one of the worst such storms in the past 15 to 20 years.

Central Oregon also got hit with about eight inches of snow and Oregon State University closed its Bend campus due to weather conditions.

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Rodriguez reported from San Francisco.

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