First Avenue South Bridge
- First Avenue South Bridge
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.
In 2001, the southbound span was damaged by the Nisqually earthquake, knocking its piers 3 inches out of alignment, and was closed briefly for repairs [cite news|title=First Avenue bridge to close this weekend for repairs | date = 2001-03-08 | work = Seattle Post-Intelligencer | url= http://seattlepi.nwsource.com/local/tl1085.shtml] .
Notes
References
* — memoirs of a civil engineer working for the WSDOT on the First Avenue South Bridge
External links
Crossings navbox
structure = Crossings
place = Duwamish River
bridge = First Avenue South Bridge
bridge signs =
upstream = South Park Bridge
upstream signs =
downstream = West Seattle Bridge
downstream signs =
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