UPDATE, 8:30 a.m.: The highway is open to one-way controlled traffic, per the CHP.

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Highway 101 is closed just south of the Humboldt County line this morning, according to the Caltrans Quickmap.

The closure follows report of a semi truck overturning on the highway at about 6:20 this morning. According to Highway Patrol dispatch logs, the truck was carrying dry concrete. The CHP estimates the closure will last six hours; Caltrans, usually conservative with such things, is currently estimating the closure will last until 2 p.m.

We’ll update when we know more. If there is no STOP SIGN in the center of the map above, then the roadway has been reopened.