12th Street Bridge Replacement

Document Type

Student Presentation

Presentation Date



College of Engineering


Department of Civil Engineering

Faculty Sponsor

Dr. Mandar Khanal


This report abstract outlines the various design, construction method, and cost analysis alternatives and considerations of the Inexperienced Civil Engineers (I.C.E.) design team for the 12th Street Bridge replacement project in Idaho Falls, Idaho. The existing bridge structure is located at the intersection of 12th Street and Bonneville Drive in Bonneville County. It has a span length of 41.7 feet perpendicular to the canal and an out-to-out width of 48 feet. The need for replacement comes from the structure’s failure to meet substructure, superstructure, and deck requirements of the current Idaho Transportation Department’s (ITD) standards. In addition, the existing bridge is over 60 years old, sits below the high-water level of the canal, and has a design capacity of ten tons which is far below the new requirement of seventy-five tons. Replacement of this bridge includes the considerations already mentioned as well as a short winter-controlled construction schedule, the inability to raise surrounding grades, temporary traffic relocation, tying in proposed drainage to existing drainage, and sight clearance while turning onto the bridge.

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