Cabrillo’s Shadow, painting by RD Riccoboni© of Balboa Park San Diego California in the shadow of the arches of Cabrillo Bridge, Built for the Pan Pacific Exposition in 1915.The seven-arched, cantilevered Cabrillo Bridge is the first of its kind in California. In form, if not construction, it may have been inspired by a historic Roman bridge or Spanish viaduct. Frank P. Allen, Jr., the 1915 Exposition’s director of works, and Thomas B. Hunter, a San Francisco engineer, designed the scenic bridge. Built mostly by hand by intrepid workers on scaffolding, the bridge has hollow “legs” reinforced with steel and resting on concrete caissons. The tower of the California Building center on the horizon.