THE CONCRETE BRIDGE MAGAZINE

WINTER 2008

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

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30 | ASPIRE , Winter 2008 Few drivers today remember a time before interstate highways and clover- leaf interchanges allowed for the easy movement of traffic. Our modern road systems have become an integral part of our everyday lives. They provide for smooth access to just about anywhere motorists want to go and are a vital part of the distribution system that keeps stores stocked with goods. So it was alarming to the public and freight haulers alike when in 2001, regular bridge inspections by the Oregon Department of Transportation (ODOT) showed that the state's bridges were weakening and many required immediate weight restrictions, detours, and emergency repairs. By 2003, ODOT had been forced to place weight restrictions on 140 bridges. In March 2001, when Ford's Bridge on I-5 in southern Oregon was declared unsafe and in need of emergency repairs, the resulting detour sent large volumes of traffic—especially truck traffic—through the towns of Canyonville and Riddle for 20 days. The streets of these small towns were not designed for such high volumes of traffic. The delays in travel times associated with the detour and the disruption it caused to these two communities highlighted the seriousness of Oregon's highway bridge conditions. The most problematic structures were the cast-in-place reinforced concrete bridges built between 1947 and 1962. A majority of these bridges (52 percent) showed diagonal-tension cracking, and nearly half of them were along the north-south I-5 and east-west OREGON'S BRIDGE REPAIR AND REPLACEMENT PROGRAM by Tom Lauer, Oregon Department of Transportation Reshaping the State's Highway System with Context-Sensitive and Sustainable Solutions 10973_ASPIRE_win08.indb 30 12/12/07 3:31:30 PM

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