  :::I agree that balsa wood bridge sould be removed from the article (and would argue against Steel bridges, Concrete bridges, etc.) on the basis that it only covers the material used.  I think that transporter bridge should remain, as it is a unique type of bridge.  To me a Log bridge is a type of beam bridge and should not appear here.  There is no artlce for Caisson bridge, so Cassion should be located elsewhere.  A simple suspension bridge is a type of suspension bridge.  Water bridge is questionable.  I will impliment these changes now.   