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Washington Way Bridge

The Washington Way Bridge is located in the popular and historic Lake Sacajawea Park, which made this bridge replacement particularly challenging. Due to the park’s listing on the National Registry of Historic Places, project aesthetics were an important consideration. The popular park also features a trail system, part of which passes directly under the bridge.

OBEC led a full-service team through on-site investigations, alternatives analysis, design, permitting, and construction engineering for a three-span, 160-foot-long, pre-stressed concrete deck slab structure. The slightly arched slabs were the result of an extensive effort to understand the intent of the park’s original architects, and to reflect that character in the new design.

  • OBEC and the City of Longview worked together to refine the design and save an historic red oak tree highly valued by the community.
  • The OBEC team mitigated the risk posed by highly liquefiable soils through the design of timber pile ground improvements, which were completed using a methodology that avoided damaging the historic tree.
  • Our team added 16 new trees to the park and eliminated planned stormwater improvements west of the bridge – preserving three existing trees. This effectively reduced the new impervious surface to be treated by 75% and allowed mitigation through minor stormwater improvements on the east side of the bridge.


New trees added to the park as a part of this project.