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Flooding Risks
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Potential flooding risks
ODOT initially assessed how construction would affect the flow of the Sandy River based on having a temporary detour bridge and two temporary work bridges in the water during the winter months. The agency’s calculations showed that allowing three temporary bridges could raise water levels during severe storms. The contractor’s proposed plan used more in-water piers, causing an increased risk of flooding. The agency quickly began working with the contractor to modify its plan to avoid or reduce these impacts as much as possible.
ODOT's priority is safeguarding not only the environment and enhancing the transportation infrastructure, but also protecting the Troutdale community. ODOT is minimizing the effects of the construction project by reducing the number of temporary bridge piers and pilings in the river and removing the work bridge during the rainy season. ODOT is also using an innovative top-down construction method to roll girders using gantry cranes from the staging area to their designated location, which allows the contractor to keep working without a work bridge in the water. 
As an added precaution from potential high-water levels, crews installed a 1,200-ft. temporary flood barrier on the river's west bank.
All I-84 traffic has been temporarily shifted to the new eastbound bridge and the existing detour bridge has been converted to a work bridge to build the new westbound bridge, eliminating the need to build a new westbound work bridge.

Flood Insurance
As the Interstate 84 Sandy River Bridge construction project nears completion, ODOT reminds local property owners that its flood insurance reimbursement program will end May 31, 2014. Beginning June 1, property owners will be responsible for their own flood insurance costs if you wish to maintain coverage.