A portion of Highway 29 in St. Helena was shut down Thursday while emergency crews responded to a hazardous materials incident.
The highway closure was from Stice Lane to Whitehall Lane, according to the Napa County Sheriff's Office. In addition, there was a closure on northbound Highway 29 to Rutherford Crossing/Highway 128.
Motorists were asked to avoid the area.
The highway reopened at 12:45 p.m.
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