Can one bridge do the work of two? That was the question Sundt asked when considering the plans for an interchange improvement project north of Phoenix.
The original design of the interchange at Interstate 17 (I-17) and State Route 69 (SR 69) included two I-17 bridges crossing over SR 69 below. To build the bridges, Sundt and our joint venture partner would need to excavate more than 400,000 cubic yards of dirt – a costly and time-consuming operation. Our team saw a better solution, so we worked with the Arizona Department of Transportation (ADOT) to reconfigure the design and construct just one bridge, with SR 69 going over I-17.
The idea involved using dirt already accumulated from the project to raise the grade along SR 69 before constructing the bridge. This reduced the workload considerably, allowing crews to finish construction six months ahead of schedule.
Our innovative approach saved millions of dollars for ADOT, and hundreds of man-hours, while creating a safer traffic environment for the thousands of people who pass through the interchange each year.
Arizona Department of Transportation
Cordes Junction Traffic Interchange Improvements