Idaho Bridge Project Wins Top Repair Award

Staff | September 28, 2010

Des Plaines, Ill.— The Repair and Preservation of the Historic Rainbow Bridge, Valley County, Idaho, has been chosen by the International Concrete Repair Institute as the ICRI 2007 Project of the Year.

The Rainbow Bridge on State Highway 55 is the largest single-span concrete arch bridge in the state of Idaho and a landmark structure on the Payette River National Scenic Byway. Designed by Charles A. Kyle, the first chief bridge engineer in Idaho, the structure was designed to blend in gracefully with its stunning surroundings.

The structure is a reinforced concrete arch bridge approximately 410 feet in length with a main span of approximately 210 feet over the North Fork of the Payette River. The federally funded bridge was completed in 1933 at a cost of $74,000.

CH2M Hill was the engineer for the Idaho Transportation Department project. Contractors were Mowat Construction and Vector Corrosion Technologies.