A number of concrete and steel bridges where built in Seattle in the 1930s, '40s and '50s - each designed with a 60-year lifespan.
The Seattle Transportation Department says 60 of the city's 137 bridges are more than 60 years old and would cost $1.1 billion to replace. The Seattle Daily Journal of Commerce reports department Manager John Buswell told the city council's Transportation Committee this week that another Bridging the Gap levy might be needed.
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