Lake Lanier is considered dangerous due to a combination of factors: heavy boat traffic leading to frequent collisions and boating accidents, the presence of numerous submerged hazards like old roads, building foundations, decaying trees, and underwater debris from the towns and structures flooded when the lake was created. The lake's murky water severely limits visibility, making it difficult for swimmers, divers, and boaters to see and avoid these dangers. Additionally, sudden changes in depth and the possibility of underwater entanglements contribute to the risk. Alcohol use by visitors also plays a significant role in accidents. The lake's dark history—including the flooding of towns, cemeteries, and burial sites—adds to local legends of hauntings, which some associate with its perilous reputation. Despite safety efforts, Lake Lanier continues to be one of the deadliest lakes in the United States, with hundreds of deaths since its creation and rising fatality numbers in recent years.