First Avenue South Bridge
|First Avenue South Bridge|
The original First Avenue South Bridge over the Duwamish, before the construction of the southbound span
|Total length||3,010 ft (920 m) (northbound)
2,895 ft (882 m) (southbound)
The First Avenue South Bridge is a pair of double-leaf bascule bridges built between 1956 and 1998 that carry State Route 99 over the Duwamish River about three miles (5 km) south of downtown Seattle, Washington.
The northbound span was built in 1956 to connect the industrial areas northeast of the Duwamish to the residential neighborhoods to the south and southwest. Between 1996 and 1998, the drawspan was retrofitted and the approaches completely demolished and rebuilt. The southbound span opened in 1996 and carried traffic in both directions for two years while the northbound span was rebuilt.
- "Bridge List" (PDF). Washington State Department of Transportation. May 2010. Retrieved 11 April 2011.
- "First Avenue bridge to close this weekend for repairs". Seattle Post-Intelligencer. 2001-03-08.[dead link]
- Chuck McGowan. "The First Avenue South Bridge project". — memoirs of a civil engineer working for the WSDOT on the First Avenue South Bridge
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