Category: Monthly Webinar Dogwood Bridge Replacement Utilizing Press Brake Tub Girders

June 13, 2024 1:00 pm

John Gay, P.E., Imperial County Public Works Director; Darab Bouzarjomehri, P.E., Senior Project Manager, NV5, Inc.; Guy Nelson, S.E., P.E., Product Development Director, Valmont Structures

Webinar Documents:
Presentation Slides:  IBT ABC-UTC Dogwood Bridge Press Brake Tub Girders
Announcements:  June 2024 Intro and News


This project consisted of replacing a three-span, reinforced concrete slab bridge that has subsided over the years, losing its original 2 feet of freeboard.  The bridge was replaced with a new 90 ft single-span galvanized Steel Press Brake Tub Girder bridge.  This presentation will discuss challenges and lessons learned while working through challenges such as maintaining the flow in the Westside Main Canal, maintaining power and gas transmission lines, and an accelerated schedule to maintain this highway to support the critical agricultural infrastructure through the Imperial Valley. This project was able to use innovative materials and strategies under an emergency declaration, which allowed quick action and collaboration with the consultant, NV5, the steel fabricator, Valmont Structures, and multiple utility agencies. This is the first Steel Press Brake Tub Girder Bridge that has been constructed in California. Due to the success of this project, there are now two more of its kind constructed in California and an additional two are currently being designed by CALTRANS. The project was awarded the San Diego ASCE – Outstanding Bridge Project award, and a Regional APWA Project of the year award.




John Gay, P.E.
County Director of Public Works; Imperial County, CA



John Gay is the County Director of Public Works / Road Commissioner for Imperial County, CA.  He has 27 years of both public and private engineering experience.  John is a lifelong resident of the Imperial Valley.  He has a BSCE from University of California at San Diego and is a licensed professional engineer in CA.



Darab Couzarjomehri, P.E.
Engineering Manager – Transporation; NV5, Inc.


Darab Bouzarjomehri is an Engineering Manager for the Infrastructure Group for NV5, San Diego. He has 16 years of public and 23 years of private consulting experience on a variety of transportation project including bridges and roadways. His public experience is with Minnesota Department of Transportation and Port of San Diego. He is licensed in CA and MN.  Darab has a BSCE from University of Minnesota and an MS from University of Wisconsin.




Guy Nelson, S.E., P.E.
Product Development Director; Valmont Structures



Guy Nelson is the Product Development Director of the Valmont U-BEAM Press Brake Tub Girder. He has more than 27 years of experience in structural design and construction services related to bridges, buildings and retaining structures.  He received his Masters of Science in Structural Engineering from Michigan State University and is a licensed professional engineer.

Presentation Photos/Graphics:

1) Old bridge structure subsidence resulted in debris buildup, overtopping, and reduced conveyance.

2) Assembled press brake tub girders on temporary abutments.

3) Girders with cast concrete deck being placed over canal.

4) Completed bridge replacement.  Freeboard restored.

5) Ribbon Cutting

6) Completed bridge.