Boating Access in Mount Gilead Lake Tillery (Lilly’s Bridge Cove)Lake Tillery is more than 5,000 acres with 104 miles of shoreline. A maximum depth of 70 feet and water Lake Tillery Marina & Boat RentalsLake Tillery is more than 5,000 acres with 104 miles of shoreline. A maximum depth of 70 feet and water