East River Marine in Madison operates a well-protected marina on the East River, just north of Route 1, with great access to Long Island Sound. We have about 30 slips, all with electricity and fresh water, and the facility has flushable toilets. Our boat launching ramp is available to customers; boaters can purchase day or seasonal passes. We sell and service Yamaha Marine engines, and sell, repair and store boats.. Yamaha Marine Engine Sales; Yamaha Marine Engine Repairs; Yamaha Marine Engine Service; Marina; Boat Yard; Boat Slips; Boat Storage; Boat Dealers; Used Boats; Outboard Motor Repair; Outboard Motor Sales; Boat Launch; Boat Maintenance; Boat Repairs; Docks