The Allegheny River in 1906. The old Sixth and Seventh Street bridges span the river as empty barges make the trip back to West Virginia for another load of coal to feed the steel furnaces upriver. Many buildings on the riverfront are still there today. The photo below shows both riverbanks and includes the old Exposition Park, then the home of the Pittsburgh Pirates. The bottom photo shows the old Baltimore and Ohio Railroad Station on the north bank of the river. The building was nicknamed the "Ark" as it was frequently submerged when the river rose.