WKE and its principals have built their careers on transportation projects. Our extensive engineering and construction experiences cover a range of multi-modal transportation projects on streets and highways, bridges and viaducts, airport taxiway and runway structures, freight corridors and freight rails structures, transit and light rail facilities and structures, marine and marginal wharf structures. The principals at WKE bring a collaborative team approach to a project and have delivered successful projects for public and private clients on conventional design-bid and projects using alternative delivery method. Our core value of providing professional engineering services to meeting our client’s high expectations of quality work and timely delivery has made us a trusted partner on any project.

  • Highway

  • Structures

  • Rail / Transit

  • Ports + Harbors

Rice Avenue/Fifth Street Grade Separation

Oxnard, CA

WKE is completing the final design PS&E for the grade separation of Rice Avenue over Fifth Street (SR 34) and the UPRR tracks. As a designated heavy freight corridor from Port Hueneme to US 101, this safety improvement project will construct a six-lane bridge on Rice Avenue over the UPRR tracks and SR 34 that would stretch approximately 800 feet north and south of the crossings, and would include sidewalks and bike paths in each  direction.

I-15/Railroad Canyon Road Interchange Improvements

Lake Elsinore, CA

WKE is delivering the PS&E for improvements to the I-15/Railroad Canyon Road Interchange by converting the existing diamond interchange to a partial hook ramp, which includes widening the existing structure to accommodate a new on-ramp.

SR 55 Improvements (I-405 to I-5)

Orange County, CA

WKE is delivering the PS&E of a four-mile corridor of SR 55 between I-405 and I-5, which proposes to add a second HOV lane, a fifth general purpose lane, and auxiliary lanes in each direction. The project also includes ramp reconfigurations and structure widenings.

SR 241/SR 91 Express Connector

Anaheim & Yorba Linda, CA

WKE is the prime consultant responsible for delivering the PS&E for the construction of a median-to-median toll lane connector between the SR 241 and SR 91 Express Lanes. The project proposes to widen SR 91 and SR 241 for six miles and reconstruct the Gypsum Canyon Interchange.

Berth 90 & Berth 91

Port of Los Angeles, CA

WKE designed the 72,000-square-foot Interim Cruise Terminal Baggage Handling Building. Work on the pedestrian expansion included all site-work development and building design plans, and agency coordination.

Citrus Ave & Palm Drive Grade Separations


WKE staff prepared the PS&E and completed the PUC application approval for the construction of the railroad grade separation structures at Citrus Avenue in the city of Azusa and Palm Drive in the city of Glendora. WKE designed the vertical and horizontal realignment of the existing track to be placed at the ultimate location upon completion of the grade separation structures.

Fairway Drive Grade Separation


WKE is currently preparing the PS&E for this structure which separates the operation of Fairway Drive from the existing Union Pacific tracks. The project includes the new railroad bridge with associated retaining wall structures, the depression of portions of Business Parkway and Walnut Drive, and maintains access to adjacent businesses and public facilities.

Foothill Blvd Bridge Widening


WKE completed the PS&E for the HBP-funded widening of Foothill Boulevard over San Dimas Wash. The project included the design of a single-span slab bridge widening over the San Dimas Wash on both sides of Foothill Boulevard, widening the roadway approaches, channel
improvements, modifying the channel maintenance access points at three locations, and removing portions of the existing bridge over the wash.

I-405/I-605 West County Connector


WKE provided structural engineering design services and prepared the preliminary and final design for construction of the I-405/I-605 HOV connectors, and the EB SR 22 to NB I-405, and EB SR 22 to NB I-605/I-405 separation structures. The project added a 3,000’-long direct HOV connector viaduct to connect the NB I-405 HOV lane to the HOV lane on the NB I-605 and the reverse movement.

I-5 Improvement Project


WKE is providing project management and engineering design services to OCTA for the improvement of I-5 from SR 73 to South of Oso Parkway. The project plans to reconstruct and widen Avery Parkway from Camino Capistrano to Marguerite Parkway to provide additional capacity and improve access to I-5. The Avery Parkway Bridge undercrossing will be replaced to allow for the widening of Avery Parkway and improve the vertical clearance.

SR 91 CIP Design-Build


WKE provided structural engineering design services for the SR 91 CIP. Within the project limits there are 32 bridge structures and nearly six miles of retaining walls, both standard and non-standard, including a new HOV direct connector from SR 91 to I-15 south, and four new connectors at the SR 91 and I-15 Interchange.

I-605/SR 60 PSR-PDS


WKE assisted Metro in preparing the PSR for improvements along six miles of the I-605 Corridor from Beverly Boulevard in the city of Whittier to north of I-10. WKE is responsible for the development of project alternatives to increase capacity and improve safety along the I-605, I-10, and SR 60 Corridors, and at three local interchanges.

First Street Bridge


WKE provided the preliminary engineering, type selection report, and final PS&E documents for the 26-foot widening of the historical First Street Bridge located in Downtown Los Angeles. The project accommodated additional lanes and the construction of the double track Eastside Light Rail Transit extension.

Manor Street Bridges


WKE is completing the seismic assessment, environmental documentation, PS&E, and construction support for the seismic rehabilitation of the Manor Street Bridges over the Kern River. The project requires close coordination with the city of Bakersfield, Caltrans, Kern County, and permitting agencies.

San Francisco to Oakland Bay Bridge Replacement (SFOBB)


The SFOBB project replaced the seismically damaged eastern Oakland steel spans from Yerba Buena Island to the Oakland shore. WKE assisted with the concept development and PS&E delivery of the Oakland Touchdown.



Provided engineering design services to OCTA for the preparation of the PSR-PDS to improve six miles of SR 91 between State College Boulevard and Lakeview Avenue including preliminary geometrics of the freeway reconfiguration at SR 57 and SR 55. WKE coordinated closely with OCTA, cities of Orange and Anaheim, and Caltrans.

SR 57/SR 60 Confluence


WKE is providing project management and engineering design services to the City of Industry for the realignment and reconstruction to the Grand Avenue interchange and bridge, the SR 57 connector reconstruction, and the reconstruction of the Diamond Bar Boulevard on-ramp to SR 60.

Gold Line Foothill Extension (Phase II)


WKE provided structural engineering and management support to the Foothill Extension Construction Authority. The $700 million project involved an extension of the Gold Line of approximately 14 miles of track in the median of the I-210 from the Sierra Madre Station to the Azusa Station.

SR 22 Design-Build


This project added an HOV and auxiliary lane in each direction for approximately 12 miles between SR 55 at the easterly end of SR 22 to Valley View Street at the westerly end, as well as constructed three new bridges, replaced nine bridges, and widened and retrofitted 22 bridge structures.

Berth 100 South Extension Container Wharf


WKE provided project management under POLA for the design of a 900-foot extension of the Berth 100 container wharf structure. The design met the latest POLA three-level seismic design criteria, incorporating state-of-the-art structural analysis and design for a modern concrete container wharf structure on vertical piles.

Badger Avenue Approach Trestle


WKE was responsible for the design and computer modeling of the approach trestles and support piers for the 220-foot long main lift span structures over the Cerritos Channel for Port of Los Angeles. The structure replaces the existing Strauss Trunnion Bridge and includes 180-foot high main towers.


  • Wei Koo, P.E., S.E.

    As President, Partner, and Director of Structures, he leads the management of all structure-related projects, as well as the execution of all financial and administrative decisions for WKE. He brings over 30 years of design and management experience for large-scale transportation projects, delivering over $2 billion in infrastructure projects throughout the western United States.

  • Carlos Cadena, P.E.

    As Vice President, Partner, and Director of Engineering, he is responsible for the management and delivery of all highway and transportation projects at WKE. Carlos offers over 30 years of highway planning, design, and management experience for highway projects totaling more than $2 billion in construction cost.

  • Dan Weddell, P.E.

    Over 20 years of transportation management experience. Dan has delivered the preliminary and final design of complex highway improvement projects and is familiar with PSR, PR, PS&E involving state and local roadway projects. He has a thorough understanding of the Caltrans project delivery process to allow projects to go through review by Caltrans expeditiously.

  • Vinh Trinh, P.E., S.E.

    More than 20 years of planning and design experience in highway and structures. Vinh has managed a multitude of structural projects including new bridges, seismic retrofit, widening, interchanges, grade separations, and retaining walls. His experience portfolio includes advanced planning studies, project reports, project study reports, and PS&E delivery.

  • Hank Nguyen, P.E.

    Over 20 years of project management and design experience in highway geometrics, light rail transit, grade separations, alternatives analysis, grading and drainage, preparation of detailed construction cost estimates, and utility coordination. Hank is experienced in Caltrans design standards and local agency requirements, as well as with fast track projects. 

  • Michael Hynes, P.E.

    Over 15 years of experience in the management of highway and civil engineering projects in southern California and the Middle East. Michael successfully delivered a large and challenging portfolio of major highway and road improvement projects, taking responsibility from the planning phase through to the completion of detailed design and construction.

  • John Ballas, P.E

    Over 35 years of managing complex capital improvement projects. Experienced in freeway interchanges, grade separations, large-scale industrial developments, water systems, and publicly owned electric utilities. He has strength in serving as “owner representative” and developing strong relations to advance projects into successful outcomes.

  • David Lew, P.E.

    Over 20 years of transportation engineering experience in PA/ED and PS&E project delivery for Caltrans and various local agencies. David has managed and delivered over 50 design freeway projects in southern California, which include: I-5, I-10, I-15, I-215, I-405, I-605, US 101, SR 22, SR 55, SR 57, and SR 91. David specializes in Caltrans PS&E delivery and construction design support.

  • Mainak Dey, P.E.

    Over 10 years of extensive experience in conceptual and final design of complex transportation projects. Mainak is experienced in preparation of PS&Es with Caltrans reviews and approvals, and has in-depth understanding of Caltrans design procedures and standards. He has led engineers on complex highway design projects, and is experienced in managing comment resolutions.