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8:30 p.m. update: I49N has reopened. One lane of I49S will be closed until the big rig is emptied and towed away.

Caddo deputies are diverting traffic on Interstate 49 north at mile marker 217 following an 18-wheeler crash, said Sheriff Steve Prator.

The truck was heading south to Houston when its driver hit a bump and lost control. The 18-wheeler carrying ferric chloride flipped over into the median. The driver appears to be okay and remained on scene. Hazmat crews were notified and are inspecting the truck.

Traffic will be diverted off I49 northbound onto highway 1. The road is expected to be closed for several hours.