Every spring from 1870 through 1915, crews on rafts drove more than a quarter of a million spruce logs 300 miles down the Connecticut River, from its headwaters near Quebec to sawmills in Massachusetts. The five-month-long drive was crucial in delivering the lumber needed to build several 19th-century New England cities. Underwater footage dredges up the forgotten history of these treacherous log drives, revealing lost tools, whiskey bottles, and sunken riverboats, while historians share tales of the daring river drivers, their hazardous occupation, and the rowdy entertainment they sought out when the load was finally delivered.