Category: Monthly Webinar Bridge Slide over Gila River on SR 79 in Arizona – 1,416’ Span

July 18, 2024 1:00 pm

Robert Ringwald, P.E., S.E., Senior Project Manager, Associate Vice President, AECOM
Christopher A. Labye, P.E., Senior Bridge Engineer, Technical Quality Auditor, AECOM

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Announcements: This portion of the IBT/ABC-UTC Monthly Webinar will provide you with the latest happenings related to Innovative Bridge Technologies and ABC in the US and abroad to keep you informed. (10 minutes)

Featured Presentation:  Bridge Slide over Gila River SR 79 in Arizona - 1,416' Span (35 minutes)











This 1,416'-10" span bridge replacement project was completed in 2023.  The 14 spans bridge was replaced as a series of 4 x 3-span units and 1 x 2-span unit, on each side.  Each half of the bridge was slid over the course of two separate weekends.   The project is over the Gila River on State Route 79 located immediately north of Florence, Arizona.  The “shortest” detour was over 100 miles in length, therefore, full closure of the bridge for reconstruction was not practical.  A phased bridge slide method was implemented to utilize portions of the new bridge to phase removal and reconstruction activities such that traffic could be maintained during construction.



Robert Ringwald, P.E., S.E.
Senior Project Engineer, Associated Vice President

Rob has 33 years of experience in engineering and another 5 years in construction. He is an Associate Vice President at AECOM. He has served as a project manager on numerous major freeway and rural projects utilizing various delivery methods including design-bid-build, design-build and construction-manager-at-risk.  His recent experience includes two accelerated bridge construction (ABC) bridge slide projects. Rob graduated from Arizona State University with a BSE in Civil Engineering and a MSE in Structural Engineering.



Christopher A. Labye, P.E.
Senior Bridge Engineer, Technical Quality Auditor


Chris as a senior bridge engineer and technical quality auditor for AECOM and also serves as lead quality manager for the Phoenix and Tucson offices in Arizona.  Chris has 27 years of experience in bridge design, and approximately 4 years of geotechnical engineering in transportation.  He has served as the lead bridge designer for over 50 miles of preliminary design concept reports and bridge selection reports for the Phoenix Metropolitan Freeway System. Chris graduated from the University of Colorado, Boulder, with a BSE in Civil Engineering.

Presentation Photos/Graphics:

1) Superstructure construction adjacent to existing bridge

2) Demolition of existing bridge

3) Night bridge slide in progress

4) Day image of bridge slide in progress

5) Completed Bridge

Question & Answer Period: Submit your questions when you register for the webinar and also in the question box during the webinar. (15 minutes)

Certificate of Attendance: Each site registered for this webinar will receive an email for your response. Just click the first link in the email to obtain a certificate. For multiple participants at a site, the point-of-contact registrant for that site also clicks the second link in the email, logs in, and clicks “Attendees” to provide first name, last name, and email address for each participant at that site; each participant will then receive an automatic email with link to print an individual certificate. Accessing the second link in the email will also allow participants to print certificates for past webinars that were attended by simply clicking the webinar title. Please let Ms. Ankitha Arvan at FIU know if you have questions or need assistance with receiving your certificate. Anthika’s email address is

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