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State Route 99 is one of the major highways between downtown Seattle and the cities to the south, as well as Sea-Tac Airport. Carrying approximately 31,000 vehicles each day, with hundreds of boats passing under them monthly, the 1st Avenue South Bridges, formally known as the Duwamish River Bridges, are an important lifeline for residents and businesses.
In the spring of 2020, contractor crews made mechanical and electrical repairs to the northbound and southbound SR 99 Duwamish River Bridges. This work was essential, as the systems are responsible for opening and closing the bridge drawspans.
Funding came from state funds for bridge and structures preservation with a final cost of $2,019,128.63.