From the Pacific Coast Section 4 addenda (2/27/17):QuoteIt is unknown when the bridge will be replaced. Due to a lack of nearby roads, an extensive reroute is required. The reroute is 145.7 mi. and can be found at this RideWithGPS link: ridewithgps.com/routes/19189649 It is about 30 miles longer than the Pacific Coast route. It begins on map 46 in Marina and ends on map 51 south of Cayucos. Services are limited for the 60 miles between King City and Paso Robles. Also, because this route travels inland, the weather will be significantly different than that on the coast. It will typically be drier and up to 20 degrees hotter.
Just a suggestion - just past mile 136 on your route is the intersection for Santa Rosa Creek Rd / Old Creek Rd.. Take the left at Old Creek and enjoy a quiet descent and short cut to Cayucos. Part of the SLO bike club's Lighthouse Century. YMMV.