Here is a lovely graphic to explain it all. Look at Mining Ridge, above Cow Cliffs:

Date: | Saturday, December 10, 2022 at 4:30 pm |
District: | 05 – Santa Barbara, San Luis Obispo, Monterey, San Benito, and Santa Cruz Counties |
Contact: | Alexa Bertola or Jim Shivers |
Phone: | (805) 549-3237 |
FOR IMMEDIATE RELEASE
HIGHWAY 1 ALONG THE BIG SUR COAST CLOSED IN BOTH DIRECTIONS
DUE TO FLASH FLOOD WARNINGS
MONTEREY COUNTY – Highway 1 is closed from Ragged Point (PM 72.8) in the south to Palo Colorado Road in the north (PM 61.5) due to flash flood warnings being issued for the Colorado Fire and Dolan Fire burn scars.
Rainfall is expected to exceed the threshold for possible debris flow in the Dolan and Colorado Fire burn scars. The National Weather Service’s flash flood watch was modified to a warning for this coastal area of Monterey County.
The closure was made in coordination with the California Highway Patrol and Monterey County.
Caltrans will assess conditions at first light tomorrow morning to evaluate if the highway can be re-opened.