pittsburgh bridge collapsed
A 2006 study determined that Pittsburgh has 446 bridges and with its proximity to three major rivers and countless hills and ravines Pittsburgh is known as The City. The Bridges of Pittsburgh play an important role in the citys transportation system.
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Without bridges the Pittsburgh region would be a series of fragmented valleys hillsides river plains and isolated communities.
. Current wisdom holds them to be the latter. Because each of Pittsburghs Three Sisters appears to be a self-contained unit not dependent on the river banks for anchorage a debate ensued among engineers whether these structures were cantilevers rather than suspension bridges. Each bridge was built in halves toward the center with temporary diagonal struts placed between.
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