A section of Highway 1 south of Ragged Point will be closed overnight Wednesday into Thursday.
The overnight closure was originally scheduled to begin Monday night and end Tuesday morning but was rescheduled due to rain in the forecast.
The highway will now shut down at 11:55 p.m. Wednesday and reopen at 6 p.m. Thursday.
The location of the closure will be about two miles south of Ragged Point.
Emergency responders will still be able to get through, and electronic message boards will be activated to alert the public of the closure.
Caltrans says crews will be pouring concrete as part of a project to construct a viaduct and retaining wall along the highway.
The $4.1 million project is scheduled to be complete this spring.