Iowa's only island city, Sabula is located approximately 40 miles south of DuBuque. Island City Harbor at mile 534.7 RDB offers 137 long term slips and 12 transcient slips as well as a full service gas dock and indoor and outdoor storage. We also have full maintenance and repair service. Our 30 ton travel lift is capable of lifting most boats. The lakes to the west of the marina are excellent for wave runners, water skiing and wind surfing.