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SR 520 - I-405 Vicinity - Seismic Retrofit - Complete December 2011

WSDOT retrofited eight bridges on SR 520 between I-405 and 148th Avenue NE and one bridge on I-90 at Richards Road to better withstand earthquakes.

WSDOT developed its Seismic Retrofit Program in 1990 in response to the new design standards and to gain a greater understanding of the earthquake risk in the Puget Sound area. In this program WSDOT is strengthening more than 900 bridges and structures across the state.

How You Benefit
Cross GlyphImproves Safety
Strengthening bridge columns and crossbeams will reduce the risk of catastrophic failure during an earthquake.

Partnerships & Cooperation
WSDOT awarded the contract to Atkinson Construction in May 2010. Construction began in summer 2010 and was completed in December 2011.


Financial Data for PIN 852030A
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $4,012
Pre-Existing Funds (PEF) $0
Total $4,012

2005 Gas Tax (Partnership Funding) - $5.3 million

Contact Us
John Chi
WSDOT Project Engineer

Mike Murphy
WSDOT Communications

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