The lone bid for the new Bay Bridge's soaring single-tower suspension span came in more than a billion dollars over the Caltrans' estimate Wednesday. The news left transportation officials scrambling to figure out how to handle the bank-breaking bid. "We expected bad news,'' said state Sen. Tom Torlakson, D-Antioch, "but this is terrible news.'' Only the eastern side of the Bay Bridge is being rebuilt, in two sections. The first section, which begins on the Oakland shore, is made up of the 1.5- mile twin concrete viaducts now under construction. The viaducts will connect to the 1,860-foot single-tower suspension span...