Many homes and communities were isolated due to the flooding and landslides which took place across the Bay area, primarily in Santa Cruz and Marin counties.

[6] In Santa Cruz County, rainfall amounts of up to 25 inches (640 mm) fell in the San Lorenzo Valley, where 14 people were killed.

Over 1,500 people were isolated in the county due to damage to the roads being used to access its communities, caused by flooding and landslides.

[2]: 11, 38 [7] On the night of January 5, just after rain had stopped in the region, a major landslide occurred when residual moisture had caused a large section of a nearby hill to break loose and fall down on Love Creek, which destroyed 30 houses and killed 10 people who were stuck in their homes.

Due to the damages in the region, roadblocks were set up by California Highway Patrol to prevent people who didn't reside south of Corte Madera from going there.

After leaving the county, many people who lived there were stuck in San Francisco for multiple days due to portions of Highway 101 being closed as a result of the landslides.

[6] In San Mateo County, nearly 9 inches (230 mm) of rain fell in the city of Pacifica, where flooding and landslides damaged numerous homes, including some that were swept from their foundation.

In Vallejo, inside Solano County, 1,500 people were evacuated due to the rapid rising of Lake Chabot, which caused officials there to be concerned for the safety of nearby residents.

In addition, 650 people under Pacific Gas and Electric along the coasts of Sonoma and Marin counties lost power.

[9] As a result, many skiers there were trapped, all major roads along the range were closed, and over 100 snowslides were triggered by the United States Forest Service to prevent avalanches.