The Washington State Department of Transportation (WSDOT) is providing additional details about its Boyer Hillside regrade project after receiving feedback from
The Washington State Department of Transportation is providing additional details about its Boyer Hillside regrade project after receiving feedback from neighbors about the work and the limited advance notice before construction began.
WSDOT acknowledged Friday it did not provide residents with much advance notice, saying the agency needed extensive analysis to confirm the construction method was safe and feasible. SR 520 Portage Bay Bridge project According to WSDOT, the original construction plan called for installing about 100 reinforced concrete drilled shafts, each 4 to 6 feet in diameter, requiring switchback access roads, heavy excavation, crane operations, concrete pumping, and months of truck traffic and vibration.
That work was expected to last six to nine months. Instead, the agency selected a hillside regrade that it says will reduce the number of drilled shafts by 65% to 85% and shorten construction to about four months while improving long-term slope stability and reducing overall construction impacts. WSDOT said truck traffic will peak at up to 100 trips per day, with an estimated five to six trucks per hour during the busiest periods.
The agency said daily truck volumes will fluctuate, and most haul days will involve fewer than 100 trips. About two-thirds of the truck traffic will occur overnight, with trucks staged on eastbound SR 520 to minimize neighborhood impacts. Haul routes will remain unchanged and will follow routes identified in its 2023 Neighborhood Traffic Management Plan and the SR 520 Final Environmental Impact Statement, the agency said.
A federal and state environmental reevaluation determined the revised construction method would not create impacts beyond those previously analyzed, WSDOT also said. WSDOT evaluated other options, including hauling soil via the south work trestle, westbound SR 520, and a conveyor system over Portage Bay, but determined each was either infeasible, unsafe, or would significantly affect construction or the environment, the agency said.
Beginning Monday, July, parking restrictions on portions of Boyer Avenue East will expand to 24 hours a day, Monday through Saturday, for approximately two months while crews remove soil. Similar restrictions are expected for another two months later in the project, when new soil is brought to the hillside.
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