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Place Name: Seattle, Washington
NBI Structure Number: 0003935A0000000

State Route 99

Facility Carried: SR 99
Feature Intersected: CITY STREETS & RAILROAD
Location: 3.8 N JCT SR 509

Year Built: 1952, Reconstructed: 1957

This bridge is On the National Register of Historic Places

This bridge is Structurally Deficient

Owned and maintained by: State Highway Agency

Functional Classification: Urban Principal Arterial - Other Freeways or Expressways
Service On Bridge: Highway
Service Under Bridge: Highway-railroad
Lanes On Structure: 3
Lanes Under Structure: 49

Structure Length: 3262.6 m
Bridge Roadway Width: 12.2 m
Operating Rating: 25.2 Metric Tons
Minimum Vertical Underclearance: 3.33 m over Highway
Number of Spans in Main Unit: 4 Spans
Material Design: Concrete
Design Construction: Stringer/Multi-beam or Girder

Number of Approach Spans: 179
Approach Material Design: Concrete
Approach Design Construction: Mixed Types

Bridge Railing: Does not meet currently acceptable standards.

Structural Evaluation: Basically intolerable requiring high priority of corrective action
Estimated Total Improvement Project Cost: $6374000
Year of Project Cost Estimate: 2009

Average Daily Traffic: 37428
Year of Average Daily Traffic: 2007
Sufficiency Rating: 9 %

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