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Re: AP: Wash. State bridge collapses into Skagit River; sends vehicles, people into water

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Here is a summary of inspection and rating information and basic information for I-5 Over Skagit River Bridge, a 4-span thru truss bridge , one span of which collapsed on May 23. The info is from http://uglybridges.com/1589303

Average daily traffic: 	70,526 [as of 2007]
Truck traffic: 	12% of total traffic
Deck condition: 	Satisfactory [6 out of 9]
Superstructure condition: 	Fair [5 out of 9]
Substructure condition: 	Satisfactory [6 out of 9]

Length of largest span: 	160.1 ft. [48.8 m]
Total length: 	1111.9 ft. [338.9 m]
Roadway width between curbs: 	56.1 ft. [17.1 m]
Deck width edge-to-edge: 	60.0 ft. [18.3 m]
Vertical clearance <http://uglybridges.com/1589303#> above deck: 15.4 ft. [4.7 m]
Vertical clearance below bridge: 	7.9 ft. [2.4 m]
Owner: 	State Highway Agency [01]
Year built: 	1955
Historic significance: Bridge is not eligible for the National Register <http://uglybridges.com/1589303#> of Historic Places [5]
Design load: 	MS 18 / HS 20 [5]
Number of main spans: 	4
Main spans material: 	Steel [3]
Main spans design: 	Truss - Thru [10]
Deck type: 	Concrete Cast-in-Place [1]
Wearing surface: Latex Concrete or similar additive <http://uglybridges.com/1589303#> [3]

The news reports are referring to some "heavy load" crossing the bridge before collapse, whatever that means.

Hassan Astaneh

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