Hawaii Devastated by Worst Flooding in 20 Years, Damage Could Exceed $1 Billion

Catastrophic flooding has struck Hawaii, marking the most severe deluge the state has experienced in two decades. Over 230 people required rescue operations while hundreds of homes sustained damage from the raging waters and volcanic mud.

HONOLULU — Hawaii is grappling with catastrophic flooding that has caused the most severe water damage the state has experienced in twenty years, with torrential waters demolishing homes from their foundations, carrying vehicles away from properties, and coating surfaces with dense, rust-colored volcanic sediment.

Assessment teams worked through Monday to evaluate the devastation, with officials confirming that hundreds of residences have sustained damage, alongside educational facilities and medical centers.

While no fatalities have been confirmed, rescue operations saved more than 230 individuals from the dangerous conditions.

Governor Josh Green estimated storm-related expenses could exceed $1 billion, encompassing destruction to aviation facilities, educational institutions, transportation infrastructure, residential properties, and a medical facility in Kula, Maui. Green characterized it as Hawaii’s most devastating flood event since 2004, when Manoa experienced severe inundation affecting residences and a University of Hawaii library.

On Oahu’s North Shore, renowned for its massive surfing waves, water levels surged rapidly after Friday midnight as intense precipitation fell on ground already waterlogged from storm activity one week prior. Violent currents displaced buildings and vehicles. Emergency officials issued evacuation directives for 5,500 residents north of Honolulu, though these orders were subsequently rescinded, while rescue teams saved more than 230 people from rising floodwaters.

Several residents escaped on surfboards as water levels reached waist or chest depth.

Authorities attributed much of the destruction to the enormous volume of precipitation that occurred within a compressed timeframe.

According to the National Weather Service, sections of Oahu experienced 8 to 12 inches of rainfall, adding to substantial amounts from a previous storm days earlier. Kaala, the island’s tallest mountain, received almost 16 inches during the latter part of last week, in addition to 26.6 inches between March 10 and 16.

Weather patterns called “Kona lows,” characterized by southern or southwestern winds carrying moisture-heavy air masses, have generated the recent flooding events. Climate scientists indicate that heavy rainfall intensity and frequency in Hawaii have grown due to human-induced climate change.

The most severe weather conditions appeared to conclude by Sunday afternoon.

Damage evaluation continues, but Oahu’s Department of Emergency Management had documented over 400 reports of damaged or destroyed residences by Monday, according to spokesperson Molly Pierce.

In certain areas, residents must navigate through sediment reaching knee-depth or higher to access their properties, Pierce explained.

The mud’s texture and distinctive reddish color, resulting from iron oxidation in volcanic earth, creates exceptional cleanup challenges.

“When it’s dry, the dust stains, and when it’s wet, the mud clings,” Pierce stated Monday. She likened it to dense, saturated snow.

Volunteer groups have arrived from throughout Oahu and neighboring islands to assist with debris and sediment removal, Pierce noted.

During Friday’s flooding, authorities cautioned that the 120-year-old Wahiawa dam, located north of Honolulu, faced “imminent failure risk.” While the dam has maintained long-standing vulnerabilities, concerns diminished as water levels dropped.

The earthen facility was constructed in 1906 to enhance sugar cultivation for Waialua Agricultural Co., which later became part of Dole Food Co. Reconstruction occurred following a 1921 collapse.

State officials have classified Wahiawa dam as having “high hazard potential,” stating that failure “will result in probable loss of human life.”

Since 2009, the state has issued four deficiency notices to Dole regarding the dam, and imposed a $20,000 penalty five years ago for delayed safety improvements, according to official records.

Subsequently, Dole offered to transfer the dam, reservoir, and irrigation system to state ownership in return for an agreement to repair the spillway to meet safety requirements.

“The dam continues to operate as designed with no indications of damage,” Dole stated.

Green recommended Sunday that those seeking to assist affected families contribute to the Hawaii Community Foundation, which has activated its Stronger Hawaii Fund to distribute resources across impacted islands.

The Hawaiian Council nonprofit organization also established the Kako’o Oahu initiative to provide housing and financial aid along with additional support for individuals and families. The council provided matching funds for the initial $100,000 in contributions and continues fundraising efforts.

“So many families have been displaced, homes have been damaged, and communities are facing immediate needs,” stated Hawaiian Council CEO Kuhio Lewis. “The path to recovery begins now — it cannot wait.”