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1st Avenue South Bridge (NB)

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Duwamish River Bridge

Seattle WA

Photo taken by Douglas Butler in April 2013

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Street Views 

Facts 

Overview
Bascule bridge over Duwamish River on WA 99 in Seattle
Location
King County, Washington
Status
Open to traffic
History
Built 1956
Builders
- Bruce V. Christy of Seattle, Washington (Designer)
- General Construction Co. of Federal Way, Washington (Contractor)
- Winfred T. Robertson (Designer)
Design
Bascule
Dimensions
Total length: 3,010.0 ft. (0.6 mi.)
Approximate latitude, longitude
+47.54180, -122.33434   (decimal degrees)
47°32'30" N, 122°20'04" W   (degrees°minutes'seconds")
Approximate UTM coordinates
10/550093/5265589 (zone/easting/northing)
Quadrangle map:
Seattle South
Inventory number
BH 34270 (Bridgehunter.com ID)
Inspection (as of 09/2014)
Deck condition rating: Fair (5 out of 9)
Superstructure condition rating: Satisfactory (6 out of 9)
Substructure condition rating: Satisfactory (6 out of 9)
Appraisal: Functionally obsolete
Sufficiency rating: 45.5 (out of 100)
Average daily traffic (as of 2012)
43,677

Update Log 

  • January 16, 2016: New Street View added by Douglas Butler
  • November 30, 2015: New Street View added by Douglas Butler
  • September 16, 2015: New photo from Luke
  • September 16, 2015: New photo from Douglas Butler
  • May 28, 2014: New photo from Douglas Butler

Related Bridges 

Sources 

  • K. A. Erickson
  • Wikipedia - First Avenue South Bridge
  • Douglas Butler
  • Luke