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Since 1978, Willdan Engineering has maintained a full-time design group assigned solely to highway and rail infrastructure engineering and in particular the analysis and design of bridges, sound walls, retaining walls, and culverts. 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

  • New and Replacement Bridge Design
  • Bridge Rehabilitation and Seismic Retrofit
  • Historic Bridge Rehabilitation and Seismic Retrofit
  • Bridge Inspection Reports
  • Bridge Scour Plans of Action
  • Bridge Inventory and Operating Rating Evaluation
  • Bridge Sufficiency Rating
  • HBP and Tiger Funding Application

Bridge Preliminary Engineering (Reports)

  • Bridge Type Selection Report
  • Bridge Advance Planning Studies
  • Seismic Retrofit Strategy Report
  • Life Cycle Studies
  • Bridge Planning/Feasibility Studies

Design and Construction

  • Local Bridge Replacement/Rehabilitation
  • Freeway Overcrossing, Undercrossing and Ramp
  • HOV Bridge Widening
  • Railroad Bridge and Grade Separation
  • Bridge Seismic Retrofit

Representative Project

City of Westlake Village, Lindero Canyon Road Bridge - Los Angeles County, California

SoCal APWA 2015 B.E.S.T. award in Transportation

Lindero Canyon Road interchange at the US 101 was redesigned to add a travel lane in each direction, traffic signal and signing/striping improvements, seismic retrofits and a safer pedestrian/bike path, in addition to aesthetic detail on the bridge barriers, walkways and landscaping. The stunning mural is the first of its kind over a mainline freeway.

Willdan assisted in the Project Study Report, environmental impact report, bridge deck repair design, traffic staging plans, Local Assistance Program project permit assistance, and PS&E and storm water data report for the project through Caltrans District 7 for permitting.

Representative Projects

Bridge Replacements — Glenn County, California

Stony Creek Bridge

Willdan assisted the County of Glenn with the preparation and processing of the federal aid bridge program applications, helping the County to qualify for $28M of federal bridge replacement funding. As a result of the funding award, Willdan developed the Advance Planning Studies and replacement conceptual designs for seven bridge replacements for the County, including crossings at Stony Creek (pictured above), Howard Slough, Walker Creek and Wilson Creek), and is currently developing the environmental documentation and final PS&E designs.

City of Elk Grove, Longleaf Drive Bridge–Sacramento County, California

Longleaf Dr Bridge

APWA Sacramento 2013 Project of the Year - Environmental, Large Agency

City of Rosemead, Garvey Avenue over the Rio Hondo Channel HBRR Bridge Replacement — Los Angeles County, California


Outstanding Transportation Project of the Year, APWA SoCal

Willdan provided bridge engineering design services, 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 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.

The Garvey Avenue Bridge Replacement received an Outstanding Transportation and Streets Project of the Year award from the Southern California APWA in 2008, and an Outstanding Project award from the Western Council of Construction Consumers in 2009.