The East Bridge (West Bridge in the Wii version) is a location from The Legend of Zelda: Twilight Princess. This bridge connects Hyrule Castle Town to the region of Hyrule Field located within the boundaries of the Eldin Province.
When Link first arrives in the area, the East Bridge is out and cannot be repaired until the Lakebed Temple is completed. Once this has been accomplished, however, Link can donate Rupees to the Malo Mart in Kakariko Village to aid in the restoration of the Bridge. Once the sufficient amount, that being 1000 Rupees has been collected, Malo will hire someone to repair the East Bridge.
Once this has been done, Link can speak to Gor Liggs in Kakariko Village and receive a barrel full of Hot Spring Water. This barrel must be quickly carried to the East Bridge and poured onto Gor Liggs' Son, who sells Hot Spring Water in Hyrule Castle Town. Once this has been completed, the Goron will gain the energy needed to travel to Death Mountain and collect more Hot Spring Water to sell at his market stall. Subsequently, the amount of Rupees required to open a new Malo Mart franchise in Hyrule Castle Town drastically decreases.