During the heyday of northern New England's logging and river drives during the late 19th and early 20th centuries, the spring freshet, augmented by impoundments called drive-dams or squirt-dams on far-flung upper tributaries, carried logs rolled into rivers and lakes far down the Connecticut River to mills at falls where the river was pinched by bedrock at Mount Tom. For many logging company workers, the specialists called river-hogs, the end of the drive at Mount Tom spelled the end of their employment until they joined crews going into the woods the next fall.