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I-5 - M Street Bridge & I-705 Overcrossings Seismic Retrofit

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SR7 Detour map

This ramp has reopened following a seismic retrofit project. Click here to see larger map of detour route.


April 2014

  • This projected was complete in March, 2014
  • Crews have reopened the northbound State Route 7 ramp to northbound I-705 and the left lane of the northbound I-5 exit to northbound I-705 and Tacoma City Center. Crews were able reopen the ramp four weeks early.
  • Project was awarded May 9, 2013 to Quigg Brothers, Inc.

WSDOT retrofitted I-5 bridges at M Street and along I-705 to meet current earthquake standards.

Crews installed steel jackets on the bridge columns and widened the cross beams to reinforce the bridges. These upgrades improve the integrity and performance of the bridges in the event of an earthquake.

Why is WSDOT strengthening the bridges against earthquakes?
This work is part of WSDOT's aggressive seismic retrofit program with clear goals of minimizing loss of life and disruption of commerce, as well as reducing the risks of complete bridge collapse.

The End Result
The columns supporting the M Street bridge and I-705 overcrossings will better withstand earthquakes and resist damage. Trusses, crossbeams and girders also will be better able to resist damage and make for a stronger bridge. The bridges have been upgraded to current earthquake standards.

This will keep traffic flowing on this key route and protect nearby residences, businesses and traffic from damage if the columns were to crumble or fail during or after an earthquake.

Project Benefits
Stronger columns, crossbeams and girders help the bridge resist earthquake damage.

What is the project timeline?
March 2013: Advertise for construction
May 2013: Award contract
June 2013: Construction begins
Arpil 2014: Construction complete

Financial Information

Financial Data for PIN 300599I, 300599P, 300599Q
Funding Source Amount ($ in thousands)
2003 Gas Tax (Nickel Funding) $0
2005 Gas Tax (TPA) $0
Pre-Existing Funds (PEF) $5,115
Total $5,115

Project signage will reflect the cost of construction engineering, project bid award and sales tax.

How can I get more information?
Kim Mueller
WSDOT Project Engineer

Claudia Bingham Baker
WSDOT communications

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