Honolulu emergency management officials have lifted all evacuation orders for residents downstream of the Wahiawa Dam after water levels in the reservoir stabilized over the weekend.
The evacuation, which affected between 4,000 and 5,500 people in Waialua and Haleiwa, was triggered Friday morning when heavy rainfall caused the reservoir to exceed safety thresholds.
Extreme weather brought by back-to-back Kona Low storms delivered up to 16 inches of rain in 24 hours, with some areas receiving 50 inches total.
By 5:35 a.m. on Friday, the water level at the 120-year-old dam rose from 79 feet to over 85 feet, prompting officials to warn of a potential breach.
Emergency sirens were activated across the North Shore as authorities urged residents to leave immediately, citing the high hazard status of the earthen structure.
First responders and the Hawaii National Guard conducted approximately 230 rescues, including the airlift of 72 individuals from a youth camp located in the flood zone.
While dozens of homes were damaged or shifted off their foundations and 10 people were hospitalized for hypothermia, no deaths or missing persons have been reported.
Dole Food Company Hawaii, the current owner of the dam, confirmed that the structure did not experience failure and operated according to its original design.
The dam was built in 1906 for sugar irrigation and has been the subject of multiple state deficiency notices regarding its maintenance and spillway capacity.
A pending 26 million dollar agreement is in place for the state of Hawaii to acquire the dam and reservoir from Dole to facilitate necessary upgrades.
Officials noted that the emergency order was a proactive measure based on conservative safety thresholds rather than an active structural collapse.
By Saturday afternoon, reservoir levels dropped below the evacuation trigger to approximately 81.83 feet, allowing residents to return to their homes.
Damage assessments are currently underway, with preliminary estimates suggesting statewide costs could exceed 1 billion dollars due to infrastructure and property loss.
A Flood Watch remains in effect for the region as weather forecasts indicate the potential for additional rainfall throughout the upcoming week.