Design Services
OPAC's creative approach to engineering design and problem solving has provided the background for design of numerous unique or unusual structural systems for bridges, transit stations, industrial structures, and buildings.
OPAC's designs are based on a commitment to rational forms, sound engineering judgements, quality aesthetic treatments, practical construction methods and the adoption of performance-based design principles from conception through construction.
Our arch bridges reflect this design philosophy applied to small and large structures in both steel and concrete. The use of classic forms with modern detailing provides an aesthetic design that is both timeless and appealing, as well as a structural design that is economical, durable, and maintainable.
Our cable-supported bridges bring creative thinking to another classic form. A balance of constructibility, aesthetics, and performance issues helps to provide an optimized solution.
OPAC offers the following design services:
| Facilities/Structures Design: | Bridge Design: | |
| River & strait crossing | Pre- and post-tensioned concrete | |
| Highway interchange | Segmental concrete box girders | |
| Pedestrian / bicycle overcrossing | Multi-cell concrete box girders | |
| Elevated viaduct | Cable stayed | |
| High speed rail | Suspension | |
| Rapid transit | Steel box girders | |
| Thin shell concrete dome | Steel plate girders | |
| Long-span structure | Steel arch | |
| Special / unusual structure | Concrete arch |
Selected OPAC Design Projects: (50 Total, 5 on this page)
BART Substations Replacement - Structural Design and Construction Support
Structural design and construction support for BART traction power facilities replacement projects.
San Francisco Bay Area, California. Scheduled construction completion 2024
BART 34.5 KV Cable Replacement - Structural Design and Construction Support
Structural design for BART 34.5 KV Cable Replacement project.
San Francisco Bay Area, California. Scheduled Construction Completion 2022
Chalk Hill Road Bridge Replacement - Design and Construction Support
Design of a girder bridge or an arch bridge to replace an existing arch bridge in rural Sonoma County.
Sonoma County, California. Scheduled design completion 2021
Lambert Bridge Road Bridge Replacement - Design and Construction Support
Design of a concrete arch bridge to replace the existing truss bridge in rural Sonoma, California.
Sonoma County, California. Scheduled design completion 2020
Gerald Desmond Bridge Replacement - Independent Check of the Cable-Stayed Bridge
Independent design check of a cable-stayed bridge, with span lengths of 500 ft., 1000 ft. and 500 ft.
Long Beach, California. Scheduled construction completion 2019