Welcome! Blue Diamond Marina is Priest Lake's deepest water marina, located on the secluded west shore of Cavanaugh Bay just 5 miles north of Coolin, Idaho. We offer all-season deep-water moorage in covered and uncovered slips with access for the physically challenged, inside secured storage, a wide variety of modern boat rentals, lakeside lodging, and The Waterfront Restaurant specializing in Italian and vegetarian cuisine. Recreational opportunities abound year-round in the Priest Lake area. Summer activities include water sports, fishing for trophy Mackinaw trout, hiking, biking, photography, river running, golfing and huckleberry picking. Fall and winter weather turns recreational pursuits to such activities as hunting, mushroom gathering, ice fishing, cross country skiing, snowshoeing and snowmobiling on 400 miles of groomed trails. History Blue Diamond was originally built in the early 1900s as the logging truck repair center for Diamond International Corporation and continued in that capacity for several decades until it was converted to a marina in the 1960s. By the late 1980s the aging buildings were suffering from their years of history. Restoration and renovations began in the mid 1990s, and today, Blue Diamond stands as a modern marina while still retaining the ambiance, charm and relative solitude reflective of the facility's history.