Heavy rainfall has caused significant flooding on Oʻahu's North Shore, leading to property damage and prompting evacuation orders for 5,500 residents. The Wahiawā Dam, a 120-year-old structure in Central Oʻahu, is under close monitoring due to its vulnerability and the risk of imminent failure. Water levels at the dam have fluctuated, necessitating evacuations when exceeding 85 feet. Originally built in 1906 for sugar production, the dam has a history of structural issues and is classified as having high hazard potential.