Otis Reservoir is the centerpiece of this small Berkshire County, Massachusetts town of 1400. This rainy November view is of the causeway over the dam, which empties into Fall River and flows to the Farmington. Otis is a four season destination for outdoor people. In summer, the population swells to 10,000. Summer is the time for campers, hikers and fishermen. Winter activities include skiing (downhill and cross-country), ice fishing and snowmobiling.