2024-06-19 00:00:00 The official Grand Lake St. Marys app from the Lake Improvement Association. Features a lake map and directory to help you locate hot spots around the lake, from boat or automobile. Emergency information, helpful links, LIA events, and more. This is the soft launch of the Grand Lake St. Marys app. Right now it features restaurants, marinas, and stops along the Bar Stool Open. More information coming soon, including points of interest.