St. Croix River (Wisconsin–Minnesota)
The lumber industry continued to grow throughout the latter half of the nineteenth century, with larger log drives in the spring  caused dangers to navigation on the river above Stillwater. Logs were frequently caught in log jams at the narrow parts of the St. Croix River near St. Croix Falls. In 1883 the blockade was so severe it took almost two months before the flow of logs was re-established. At its peak in 1890, logging in the St. Croix River valley produced  of lumber and logs. The lumber industry continued until the last major log drive in 1912 marked the end of the rich white pine forests of the area.