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Bixby Bridge Seismic Retrofit   1  Crosby Group was contracted by Caltrans to perform a seismic peer review and retrofit design with a tight budget for this historic bridge. This review and design included preparation of plans, specifications, and detailed cost estimates per Caltrans guidelines. This bridge, located on the California Central Coast, is listed on the National List of Historic Landmarks. The structure is a 20-span concrete bridge with the middle eleven spans being supported on concrete arch ribs founded at the base of the two main towers. The bridge framing consists of concrete beams and columns. This solution maintained the budget of the client and historic features of the bridge. Copyright © The Crosby Group. All Rights Reserved.