Severe rainfall has caused widespread flooding across Hawaii, prompting evacuation orders for over 5,500 residents as officials warn of a potential dam failure. The situation highlights the vulnerability of aging infrastructure in the face of increasingly intense weather events, a growing concern for island nations globally.
On Friday, March 20, 2026, Honolulu officials ordered residents downstream of the Wahiawa dam to evacuate, citing the dam as “at risk of imminent failure.” The 120-year-old dam, long known to be vulnerable, is being closely monitored as heavy rains continue to saturate the region.
The evacuation orders primarily affect communities north of Honolulu, where streets and homes have been inundated with floodwaters. According to early reports, some homes have been swept away, though there have been no immediate reports of deaths or injuries. Firefighters and lifeguards are conducting searches for stranded individuals, hampered by civilian drone activity in the area.
“We do have reports of homes being swept away,” said Ian Scheuring, a spokesperson for Honolulu. “But the agency doesn’t know how many.”
The current flooding follows a major storm last week that caused significant damage across the state, washing away roads and homes. Another storm is forecast to bring further rainfall through the weekend, adding to the precarious situation.
Hawaii Governor Josh Green stated on social media that the Hawaii National Guard has been activated to respond to the flooding. He described the floodwaters as “chest-high” and warned it would be “a very touch-and-go day.”
Honolulu Mayor Rick Blangiardi said in an afternoon news conference, “There’s no question that the damage done thus far has been catastrophic.” Officials are still assessing the full extent of the destruction, with dozens, if not hundreds, of homes reported damaged.
There are 13 regulated dams on Oahu, most of which were built before modern construction standards, according to the Honolulu Department of Emergency Management. The Hawaii Department of Land and Natural Resources administers the Hawaii Dam and Reservoir Safety Program to mitigate the risk of dam failures.
The National Weather Service in Honolulu has issued a flash flood warning following dam failure on the Kaukonahua Stream below Wahiawa Dam on Oahu, as reported by ABC7. The development underscores the challenges of maintaining aging infrastructure in the face of increasingly frequent and severe weather events.
