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Final report: West Sammamish Bridge work finished but habitat monitoring continues through 2028
Summary
City staff reported on the West Sammamish Bridge final contract work, replacement costs and long-term monitoring obligations. The bridge construction cost about $42 million, mostly grant-funded, and required habitat restoration monitoring through 2028.
Engineering Director John Vicente presented a final project report on the West Sammamish Bridge, describing contract closeout work, remaining permit obligations and long-term monitoring tied to wetland and habitat restoration.
The new bridge, which opened to traffic in 2022, replaced earlier spans built in 1917 and 1938. Vicente told the council that final contract work continued into late 2024 because of delays in electrical components, supply-chain problems and agency approvals. Certain lighting electronics required parts that took many months to replace.
Vicente said the city must monitor restored wetland and habitat areas through 2028 per permit conditions and perform corrective actions —…
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