SAN FRANCISCO — A powerful storm that swept through California set rainfall records and helped douse wildfires. But it remained to be seen how much of a dent it made in the state’s drought.

The system weakened as it moved south but still dropped enough rain Monday evening to cause mudslides that closed roads in the San Bernardino Mountains northeast of Los Angeles.

In the northern part of the state, drenching rains caused widespread flooding and rock slides over the weekend. Strong winds knocked down trees and even toppled two big rigs on the Richmond-San Rafael Bridge near San Francisco. Pacific Gas & Electric reported that 380,000 homes and businesses lost power, though most had it back Monday.

Despite the problems, the rain and mountain snow were welcome in Northern California, which is so dry that nearly all of it is classified as either experiencing extreme or exceptional drought. The wet weather also greatly reduces the chances of additional wildfires in a region that has borne the brunt of another devastating year of blazes in the state.

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