No reason, there's just a lot of rivers...
Pittsburgh, Pennsylvania holds the record for most bridges in the United States. Pittsburgh has 446 bridges while there are a total of 1900 in Allegheny County. The only city with more bridges is Venice, Italy.
Pittsburgh
Pittsburgh,PA ? No, and instead of WAG, try data. It's Texas by a long shot. http://obr.gcnpublishing.com/articles/nov05c.htm
The city of Pittsburgh, PA has 446 bridges. Some of its major bridges are the Fort Pitt Bridge, the Panhandle Bridge, the Smithfield Street Bridge, and the Liberty Bridge.
Germany has most bridges
Depends on exactly what you call a bridge (footbridge, bikes, cars, trains?) but Hamburg Germany is reported to have over 2,300 bridges. Amsterdam also has more than 1000. Venice Italy has several hundred.
Steel City, the City of Champions, the City of Bridges, and Little Hollywood Hope that helps!!
Brooklyn bridges most major attractions are during christmas :)
The most common materials used in bridge building are generally steel or concrete for larger bridges, and stone or wood for smaller bridges.
truss bridges are one of the most spaceships in the undergrounds flying
Most bridges are manmade, built in the location where they are required. Some natural bridges of rock or timber exist in wilderness areas.
Arch bridges are most used in Canada and the united states