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SR 99 - Aurora Bridge and Column Seismic Retrofit - Completed March 2013

The SR 99 Aurora Avenue Bridge is a key north-south route that carries more than 80,000 vehicles each day into and out of Seattle. It is considered a vital life-safety corridor.

During this construction project, construction crews brought the 80-year-old bridge up to current seismic safety standards. Crews replaced expansion joints, added steel and concrete to girders and trusses and secured concrete columns that support the bridge.

Because the bridge is on the National List of Historic Places and is a City of Seattle Landmark, crews used special fiber wrap to strengthen columns and to retain the period look and feel of the columns on the north end.

Crews also repaved the sidewalk under the bridge, added handrails and lighting.  

Most of the work went well, but engineers found corroded steel on the south end during the replacement of the expansion joints. The corroded sections were replaced. 

How You Benefit
Cross GlyphImproves Safety
This bridge will now better withstand earthquakes. The added steel and concrete give the bridge more stability. New expansion joints and bearings on the north and south ends allow the bridge to roll with a significant temblor.

The new, well-lit sidewalk under the bridge provides a safer walking environment for pedestrians.

Partnerships & Cooperation
Massana Construction completed the work for $5.7 million in March 2013.


Financial Data for PIN 109946S
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $1,842
Pre-Existing Funds (PEF) $8,001
CWA $0
Total $9,843

The $5.7 million project was funded through the state gas tax and federal funds.

Contact Us
Broch Bender
WSDOT Communications
(206) 440-4699

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