http://www.acppubs.com/article/CA6519472.html?q=tivoli In Refugio County, Texas, salty coastal air and brackish water combine with a moist subtropical climate and 37 inches of rain per year to create a highly corrosive environment for steel and other traditional building materials…This is a cool bridge fabricated out of fiberglass. There is also a post about bamboo bridges in China. There are “cool” construction materials out there.