The California Department of Transportation (Caltrans) and the city of San Diego have begun work on a second phase of the $38 million retrofit and rehabilitation of the historic Cabrillo Bridge on the west side of Balboa Park.

Caltrans officials said bridge access via Laurel Street will be available to pedestrians only starting Jan. 2 and running through April. Businesses, museums and other attractions at Balboa Park will remain open for normal hours during construction, which is part of a larger project slated for completion by summer 2014.

A narrow walk path will be provided on one side of Laurel Street during the closure, for pedestrians and bicyclists who walk their bikes.

The project began in the fall and will bring the Cabrillo Bridge up to current earthquake safety standards, and also will include repaving of the roadway leading into Balboa Park. Officials said overall work is expected be finished well ahead of Balboa Park’s 2015 centennial celebration.

Caltrans will occasionally implement late-night lane closures along state Route 163 during the project, with advance notice to be posted.