You can check route conditions on the CalTrans web site, which shows the portions of the route affected:
Current State Route 1 Conditions
Before driving, check with the Caltrans Highway Information Network (CHIN) 800.427.7623
SR 1 in the Central California Area
is closed from 4.6 miles north of Ragged Point to Gorda (Monterey County), due to mudslide removal. Motorists can access SR 1 from Gorda to Limekiln State Park by using Naciemiento-Ferguson Road
is closed from Limekiln Creek Bridge to 0.5 miles south of Big Sur State Park, in Big Sur (Monterey County), due to mudslide removal and bridge replacement
is closed from 1 mile north of Muir Beach at Slide Ranch to 0.2 miles south of Stinson Beach (Marin County) due to mudslide removal
Trip Savvy has suggestions how to navigate around the affected area.
What To Do If You Are Traveling South
The best thing to do is to drive on Highway One from Carmel to the turnoff for Andrew Molera State Park, then turn around and go back north to Monterey. From Monterey go to Salinas and catch US Hwy 101 south.
You can reconnect with Highway 1 through Paso Robles or San Luis Obispo and go north from there to get to Hearst Castle if you want to see it.
Taking that route, you will see the scenic Bixby Creek Bridge, the Big Sur Lighthouse and the Big Sur River running into the ocean. You'll also get good coastal views that are typical of Big Sur.
Checking road closures is easy.
Go to the CalTrans website, enter 1 (the highway number) and search. You can get the same information on mobile devices with internet browsers - or by phone at 800-427-7623.
CalTrans also has an app, but it's not as helpful as it could be. You can also check their map of road closures.