SAN JOAQUIN COUNTY (CBS SF) — A sinkhole on the I-5 south of Tracy has as shut down all northbound lanes of the major California freeway, according to officials.

All northbound lanes are shut down along I-5 in San Joaquin County, causing major traffic along one of the state’s main arteries.

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Crews were making repairs to the road Tuesday morning when the sinkhole opened up.

The hole is on I-5 south of Tracy near Highway 132. Traffic is being diverted onto northbound Highway 33 through Modesto before returning to northbound I-5.

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The sinkhole started out just one foot in diameter, but has since grown big enough to cover parts of three freeway lanes.

The closures began around 12 p.m.

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According to officials, all the lanes won’t re-open until Thursday afternoon.