The Eastgate Mall over I-805 Bridge is a reinforced concrete arch bridge in San Diego, California, built in 1971. Reinforced concrete is Concrete in which reinforcement bars (" Rebars quot or fibers have been incorporated to strengthen a material that would otherwise be Year 1971 ( MCMLXXI) was a Common year starting on Friday (link will display full calendar of the 1971 Gregorian calendar. This bridge is one of the two overcrossings in San Diego County with this unique arch design, and the other was Lilac Road over I-15 Bridge. San Diego County is a County located on the Pacific Ocean in the far southwest of the U The Lilac Road Bridge is a Reinforced concrete Arch bridge in San Diego California, built in 1978.