In Pennsylvania, thousands of logs travel down the Susquehanna on a flood when a log boom breaks
In 1851 a log boom had been constructed on the upper Susquehanna River near Williamsport, Pennsylvania to capture logs for the booming lumber industry along the river. Spring rains caused the boom to give way on May 11, 1860, sending eighty million feet of of lumber worth $300,000 cascading down the Susquehanna as far south as Harrisburg, providing the people of Cumberland and York counties with an unexpected bonanza. (By John Osborne)
Francis Vincent, Vincent's Semi-Annual United States Register.... 1st of January and 1st of July, 1860 (Philadelphia: Francis Vincent, 1860), 398.