The dramatic changes in Great Lakes water levels can have widespread impacts. High water levels can lead to flooding, erosion, and damage to infrastructure such as docks and roads. Conversely, low water levels can strand boats and expose shorelines, affecting recreational and commercial activities. For example, Lake Ontario's 2.5-foot rise in spring 2026 caused visible changes to docks and waterfront areas. Additionally, wind-driven surges can cause sudden and significant water level changes, particularly in shallower lakes like Lake Erie, leading to localized flooding and property damage.