 The men working at the end of the boom would sort the logs according to their corresponding brand and float them into the correct holding pond along the bank of the river.During the height of the lumber industry in Lycoming County, 1861–1891, the various mills produced 5.5 billion board feet (13,000,000 m³) of lumber.Williamsport became one of the most prosperous cities in Pennsylvania and in the United States.