Traffic was tied up in St. Helena on Saturday after a car collided with a utility pole, knocking power lines into the roadway.
Main Street between Pratt Avenue and Deer Park Road was closed in both directions after the incident was reported around 2:30 a.m., police sources said.
Local authorities issued several Nixle alerts Saturday morning to advise drivers to avoid the area and take alternate routes.
The northbound lane reopened around 2 p.m.; but the southbound lane remained closed as of 5 p.m.
PG&E reported more than 180 customers lost power on Saturday. The agency expected to have power restored by 11 p.m.