The recent collapse of the I-5 Bridge over the Skagit River
in Washington State has brought further attention to aging and failing
infrastructure throughout the country.
The bridge was actually collapsed due to a collision with a truck
carrying drilling equipment higher than the posted clearance of the bridge, but
nevertheless, according to the 2013 Infrastructure Report Card from ASCE, the
American Society of Civil Engineers, 4.7% of the 7,840 bridges in Washington
are structurally deficient. 21.6% of
Washington’s bridges are functionally obsolete, meaning that they are narrower
than currently standard, have a load limit imposed, and are usually beyond
their theoretical design life. According
to the Federal Highway Administration,
30% of the nation’s bridges are beyond their 50-year design lives, and the
average age of bridges across the country is 42 years old.