Collapsed Cypress Street Viaduct in Oakland, 1989 Loma Prieta Earthquake


The massive Loma Prieta Earthquake occurred on October 17, raising awareness for the need to strengthen and retrofit state highway bridges. After the earthquake, emergency transportation was greatly impacted in the Bay Area; however, Caltrans reopened the Bay Bridge in an amazing 30 days.

Caltrans News Release Special Edition: The 30th Anniversary of the Loma Prieta Earthquake - October 3, 2019
Map of Orange County added as Caltrans District 12 in 1987


Caltrans established District 12 - Orange County, its 12th and final district.

Caltrans District-12 - Orange County home page
From 1983: color photo of a freeway filled with stopped vehicles as they approach a toll plaza.


California’s gas tax increased to 9 cents a gallon, the first increase since 1963.

Business, Transportation and Housing Agency


The Business and Transportation Agency was renamed the Business, Transportation and Housing Agency to better convey its broader mission.