The woman was found Wednesday morning in Forestville, where her car was 8-10 feet underwater, the Sonoma County Sheriff's Office says.
The victim has been identified as Daphne Fontino, of Ukiah, California in Mendocino County.
RELATED: Authorities identify 5-year-old swept away by floodwaters during California storm as search resumes
The sheriff's office says that Fontino first called 911 after 10 a.m. on Tuesday, saying that her car was stuck in floodwaters in the 6000 block of Trenton-Healdsburg Road and that water was in the car.
The call was then disconnected.
The Marine Unit, several helicopters, deputies, and rescue teams all responded to the scene and searched for the car and driver until sunset, but were unsuccessful.
RELATED: Family mourns 2-year-old killed by falling tree during bomb cyclone
Crews then began their search again on Wednesday morning and found the car submerged about 100 yards off the road.
A Marine Unit deputy dove down and determined there was a body in the car, which deputies and fire personnel then removed.
Fourteen other people have died in California as a result of the severe storms and flooding.
RELATED: Death toll from parade of storms reaches 14 as flooding, mudslides prompt evacs
"The sheriff's office sends our condolences to victim's family and friends during this challenging time," the office said in a press release posted on Facebook.
The sheriff's office also thanked Sonoma County Fire and CHP for helping in the search.