I am concerned that its replacement may be a flat deck concrete monstrosity totally out of place. I dont know if the structure is listed but at least all the materials for rebuilding such a bridge are on already on site. It should be carefully dismantled and then rebuilt by a team of skilled masons. Such bridges are our heritage CART will have the original plans in their archives and the details of recent maintenance (if any) will be extant. so get on with it.