As the state is battered by the state’s 12th atmospheric river this season, millions of residents are still on flood alert.
The extreme weather in California is predicted to end on Wednesday because the storm is moving inland, according to projections.
The Pacific Coast Highway was partially closed on Tuesday due to flooding.
The San Francisco Bay Area has had the most rain so far, with some areas receiving as much as 4.4 inches (11.17 cm) of rain, according to the National Weather Service.
Part of the retaining wall on one interstate cracked on Tuesday before collapsing under the pressure of heavy rain, the San Francisco Chronicle reported, and chunks of concrete fell down the rain-soaked hill.
Traffic delays from the damage are expected to last weeks or even months, officials said.
In another part of the Bay Area, a man driving a sewer truck was killed after high winds knocked a tree onto his vehicle, a local CBS affiliate reported.
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A train carrying 55 passengers through the Bay Area collided with another downed tree and derailed. No one was injured.
Coastal flood advisories are in effect around San Francisco through Thursday.
Thousands have been evacuated from two small California towns, Alpaugh and Allensworth, in the central part of the state in Tulare County.
While some residents have been forced to wade through several feet of water to reach their homes in the aftermath of the storm’s ferocity, additional high winds, rain and snowfall are predicted to continue in other parts of the US.
As the storm tracks east and meets cooler temperatures, a winter weather advisory has been put in place from northern Nevada to Nebraska, where snow predictions range from 3in to 10in.
A winter storm warning is also in effect in southern Nevada, northwestern Arizona, and southern Utah.
The National Weather Service has also issued a red flag warning in Texas, Oklahoma, Kansas, Colorado and New Mexico, where wind gusts are predicted to reach up to 55mph (88km/h).
Story adapted from BBC