Since 1978, Willdan Engineering has maintained a full-time design group assigned solely to structural engineering and trained in preparing analysis and design of bridges, sound walls, retaining walls, and buildings. Our division has an extensive working knowledge of the latest Caltrans, AASHTO, ACI, and AISC criteria and methods. We have designed hundreds of bridges in California.
Consulting Services
- Study and Analysis
- Bridge Advance Planning Studies
- Bridge Planning/Feasibility Studies
- Bridge Evaluations
- Bridge Inventory and Operating Rating Study
- Bridge Sufficiency Rating Analysis
- HBRR (now HBP) Funding Application
Bridge Preliminary Engineering
- Bridge Type Selection Report
- Bridge Preliminary Design
- Seismic Retrofit Strategy Report
Design and Construction
- Local Bridge Replacement/Rehabilitation
- Freeway Overcrossing, Undercrossing and Ramp
- HOV Bridge Widening
- Railroad Bridge and Grade Separation
- Bridge Seismic Retrofit
Representative Projects
City of Indian Wells, Miles Avenue Bridge Replacement — San Bernardino County, California
Willdan provided services throughout every phase of this project, from securing funding, environmental documentation, wetlands permits, geotechnical investigation; to final PS&E for roadway engineering, channel improvements, traffic, and bridge design; and construction management. The new bridge is a 550-foot-long, five-span, curved, cast-in-place, prestressed concrete box girder structure.
City of Rosemead, Garvey Avenue over the Rio Hondo Channel HBRR Bridge Replacement — Los Angeles County, California
Willdan provided engineering design, survey, geotechnical engineering, hydrological/hydraulic evaluation, environmental documentation, utility coordination, contract administration, construction observation, and federal labor compliance services for the HBRR-funded replacement of the Garvey Avenue Bridge over the Rio Hondo Channel. The new 655-foot-long bridge ranges in width from 52 feet to 100 feet (including shoulders and sidewalks) and includes channel slopes and a bike path. A state of the art Spliced Precast Concrete Bulb Tee girder design was adopted for the replacement structure. Project construction cost was estimated at $10 million.
U.S. Army Corps of Engineers, L.A. River Bridges — Los Angeles County, California
Project of the Year, APWA
Willdan performed planning and design for a new 755-foot, 4-span Union Pacific Rail Road bridge over the Los Angeles River and a 282-foot, 3-span bridge over Dominguez Channel with hydraulic parapet walls and retaining walls on the right-of-way. The aggressive schedule required final PS&E in six months. In addition, Willdan designed modifications to a total of 24 bridges over the Los Angeles River, including the replacement of a pedestrian/equestrian steel truss bridge, and hydraulic and seismic loads and demolition plans for Horseshoe Bridge, all as part of an extensive U.S. Army Corps of Engineers flood control project, managed by Willdan, which was awarded 2002 Project of the Year in the category "Disaster or Emergency Contruction/Repair, More than $10 million" by the national American Public Works Association.
City of Mission Viejo, Clear Acrylic Sound Walls — Orange County, California
For the City of Mission Viejo and the Orange County Transportation Authority, Willdan prepared a feasibility study and PS&E and coordinated with homeowners for the innovative design of transparent soundwalls (a first in California) along the northbound Interstate 5. The City and OCTA constructed 2,700 lineal feet of 14-foot-high sound walls of clear acrylic panels and concrete masonry block pilasters.
