First Avenue South Bridge, Road and bascule bridge in south Seattle, US
The First Avenue South Bridge consists of two double-leaf bascule spans carrying State Route 99 traffic over the Duwamish River near downtown Seattle.
The original northbound span opened in 1956, connecting industrial areas northeast of the Duwamish with residential neighborhoods to the south and southwest regions.
The bridge functions as a central transportation artery in Seattle, influencing the development of surrounding industrial and residential communities over multiple generations.
Marine vessels require bridge openings lasting approximately four minutes, regulated by the US Coast Guard 13th District according to federal navigation requirements.
Between 1996 and 1998, engineers completed a major reconstruction project where the drawspan received updates while workers rebuilt the approaches from ground up.
Location: Seattle
Inception: 1956
Official opening: 1956
GPS coordinates: 47.54220,-122.33400
Latest update: November 28, 2025 14:29
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