Willdan Engineering provides consulting support in all phases of transportation project development: concepts and financing; planning and project definition; and engineering design and construction management.
Highway and Bridge Design
- Freeways and Interchanges
- HOV Lanes
- Railroad Grade Separations
- Local Streets and Roads
- Pavement Management System
- Pavement Reconstruction
- Sound walls
- Seismic Retrofitting
- Drainage Facilities
- Corridor Analyses
- GIS services
- Route Planning and Refinement
- Traffic Impact Reports
- Computer Modeling
- Capacity Evaluations
- Site Planning
- Bicycle and Pedestrian Facilities
- Congestion Management Programs
City of Agoura Hills, Kanan Road / US101 Interchange — Los Angeles County, California
APWA, SoCal: Traffic Congestion Mitigation Project of the Year
This $20 million project to relieve congestion modified the freeway mainline and two ramps, added four new ramps, realigned streets, widened two bridges, replaced one and designed one new bridge, and improved channel, drainage, and traffic.
Willdan prepared the environmental document, project report, bridge Advance Planning Studies, (processing the PR and design through Caltrans) and plans, specifications and estimate.
Orange County Transportation Authority & Caltrans, State Route 57 Widening — Orange County, California
Willdan prepared plans and specs for a 10-mile widening within the existing center median to SR 57 between the 5/22/57 interchange and the Los Angeles County line. Three mainline freeway bridges were widened, over one mile of conventional and tie-back retaining walls and three miles of sound walls, drainage structures, ramps modifications and other improvements were constructed. Willdan also provided surveys, report preparation, and construction support to Caltrans, which bid and administered construction of the project.
Orange County Transportation Authority, State Route 91 Widening / HOV Lanes — Orange County, California
Willdan prepared final plans, specifications and estimates and provided construction support for the addition of HOV lanes in each direction on SR 91 through the Cities of La Palma and Buena Park. The project included widening the freeway mainline, modifying four interchanges, widening and seismic analysis of seven bridges, sound walls, and retaining walls.
Innovative falsework designs were utilized for several undercrossings to meet vertical clearance requirements while maintaining existing local traffic flow under the bridges. Willdan was responsible for all aspects of the project, including roadway design, traffic control, drainage, surveys, right-of-way, and Traffic Management Plan.