The river is busy, apart from the winter months, with rowing, sculling, canoeing, kayaking, paddleboarding, dragonboating, and sailing, both recreational and competitive. Most of the watercraft activity occurs from the Museum of Science to the center of Watertown, above which is a dam. These see motorboat traffic from two marinas and a boat ramp near Watertown, as well as two marinas downstream and boats entering from Boston Harbor through an old lock next to the Museum of Science. A canoe and kayak ADA-accessible launch at Magazine Beach in Cambridge opened 23 September 2019.