Check out this Site which has listed hundreds of the highest bridges worldwide,
Welcome to the only web site ever dedicated to the Highest Bridges of the World. Here you will find in-depth coverage on 500 of the highest bridges ever constructed. The minimum height level for inclusion within the main body of this web site is 328 feet (100 meters) as measured from the deck level to the water or ground below it. There is an additional list of more than 100 bridges between 295 feet (90 meters) and 328 feet (100 meters) high. In late 2010, additional categories will debut with over 800 of the highest bridges in North America as well as the 50 tallest bridges of the world.