flows SE to Iyoukeen Cove, 12 mi. NE of Tenakee Springs, on E coast of Chichagof I., Alex. Arch. 5.5 miles long.
Name reported by Wright (1908, p. 124), U.S. Geological Survey (USGS). "So named because a large deposit of commercial gypsum occurs along the creek." This deposit was extensively developed between 1905 and 1925.
Cedar Cove, Coffee Cove, Corner Bay, False Bay, Fin Cove, Freshwater Bay, Game Cove, Iyoukeen Cove, Pavlof Harbor, Pileriver Cove, Square Cove, Sunshine Cove, Trap Bay, Wachusett Cove, Whitestone Harbor,
Point Augusta, Cannery Point, Columbia Point, Cube Point, East Point, East Point, Flints Point, Hawk Point, Hill Point, Iyoukeen Peninsula, Point Marsden, North Passage Point, Outer Point, South Passage Point, Sunny Point, West Point,