Alaskan Way Viaduct

Photos 

Aerial View Of Alaskan Way Viaduct, Which Starts At Left Of Rail Yards, Becomes Double-Deck Viaduct Close To Coast Guard Yard Just Above Rail Yards, And Proceeds Along Shoreline Up Into Middle Of Picture.

Photo taken by Historic American Engineering Record

View photos at Library of Congress

Map 

Street Views 

Facts 

Overview

Stringer bridge over City Streets & Railroad on WA 99

Location

Seattle, King County, Washington

Status

Open to traffic

History

Built 1952; rehabilitated 1957

Builders

- George Stevens (Bridge Engineer - WSDOT)
- MacRae Brothers (Contractor)
- Morrison-Knudsen Co. (Contractor)
- Ralph W. Finke of Olympia, Washington (City Engineer - Seattle)
- Ray M. Murray (Engineer)

Design

Stringer

Dimensions

Length of largest span: 63.0 ft.
Total length: 10,704.6 ft. (2.0 mi.)
Deck width: 40.0 ft.

Recognition

Posted to the National Register of Historic Places

Approximate latitude, longitude

+47.60000, -122.33833   (decimal degrees)
47°36'00" N, 122°20'18" W   (degrees°minutes'seconds")

Approximate UTM coordinates

10/549737/5272055 (zone/easting/northing)

USGS topographic map

Seattle South

Inventory number

BH 48615 (Bridgehunter.com ID)

Inspection (as of 03/2011)

Deck condition rating: Poor (4 out of 9)
Superstructure condition rating: Poor (4 out of 9)
Substructure condition rating: Poor (4 out of 9)
Appraisal: Structurally deficient
Sufficiency rating: 9.0 (out of 100)

Average daily traffic (as of 2010)

38,279

Categories 

Update Log 

• April 12, 2011: Added by K. A. Erickson

Sources 

• K. A. Erickson
• HAER WA-184 - Alaskan Way Viaduct and Battery Street Tunnel, Seattle, King, WA
• WSDOT Viaduct Replacement - Project Info

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