Welcome to Harbor One Marina — your go-to boating destination in Old Saybrook! Conveniently located on the Connecticut River with easy access to Long Island Sound, we offer seasonal and transient dockage, full-service marine repairs, and a fuel dock with both gas and diesel. Whether you’re stopping in to fuel up or staying for the season, Harbor One Marina delivers exceptional service on and off the water. Visit us by land or sea — we’re here to keep you cruising!