A 120-year-old dam on Oahu teeters on the brink of catastrophic failure, forcing over 5,500 Americans to flee their homes amid Hawaii’s worst flooding in 20 years.
Story Snapshot
- Over 5,500 residents evacuated from Haleiwa and Waialua due to imminent Wahiawa Dam collapse risk from relentless Kona low storms.
- Catastrophic damage sweeps away homes, vehicles, and roads after 40+ inches of rain in two weeks, with more flooding forecast.
- National Guard airlifts 72 from a flooded camp; shelters relocate 185 people and 50 pets as rescues continue.
- Aging infrastructure from the sugarcane era—132 dams statewide—exposes long-neglected maintenance failures despite years of warnings.
Flooding Onslaught Hits Oahu North Shore
Back-to-back Kona low storms dumped 26.6 inches on Kaala peak March 10-16, washing out roads and homes statewide. Overnight March 19-20, another 8-12 inches—nearly 16 more at Kaala—saturated soils and triggered flash floods on Oahu north of Honolulu.
Streets were inundated, homes and vehicles were swept away in iconic North Shore surfing areas like Haleiwa and Waialua. The National Weather Service issued flash flood warnings, prompting emergency sirens and evacuation orders for downstream residents. No deaths reported, but ground saturation from over 40 inches of recent rain amplified dangers.
Wahiawa Dam Faces Imminent Failure
The 120-year-old Wahiawa Dam, built around 1906 for sugarcane irrigation and owned by Dole, overtopped its spillway as water levels surged. Officials warned of imminent failure, ordering 5,500 people to evacuate areas downstream. Dole stated the structure operated as designed with no observed damage and proposed donating it to the state for upgrades.
State regulators flagged needed repairs since 2009; 2023 legislation allocated $5 million for acquisition and $21 million for spillway work, but transfer awaits a board vote. This marks the first major threat to the dam in decades.
Hawaii’s worst flooding in 20 years threatens dam, prompts evacuations, as more rain looms:
https://t.co/OKvcBC6gVU— WOOD TV8 (@WOODTV) March 22, 2026
Rescue Efforts and Official Response
Morning March 20, National Guard and Honolulu Fire Department airlifted about 72 attendees from the flooded Our Lady of Kea’au camp. Midday, Waialua High shelter housing 185 people and 50 pets partially evacuated as flooding hit; 54 remained by afternoon. Honolulu Mayor Rick Blangiardi assessed “catastrophic” damage to dozens if not hundreds of homes during news conferences.
Hawaii Gov. Josh Green warned of “touch-and-go” conditions via social media. Rescue operations faced drone interference; air and boat searches continued statewide under flood watch. Maui issued advisories near 2023 Lahaina wildfire scars.
Honolulu spokesperson Ian Scheuring reported homes swept away. Residents like Kathleen Pahinui voiced long-standing fears about the dam “every time it rains.” Officials expressed confidence in Hawaii’s other 131 regulated dams but noted weather unpredictability. A 2006 Kauai dam collapse killed seven, underscoring risks of aging infrastructure.
Neglected Infrastructure Demands Accountability
Hawaii’s 132 dams, mostly relics of the sugarcane industry, highlight years of delayed maintenance amid rising rain intensity. Experts cite a 2019 ASCE report urging upgrades for irrigation-era structures. State negotiations with Dole stalled despite public safety pushes.
Short-term impacts displace families, destroy property in tourism hubs, and strain resources. Long-term, potential dam failure looms catastrophic; political pressure mounts for repairs over climate excuses. Limited post-March 20 updates constrain full damage assessments, but back-to-back storms expose vulnerabilities families can’t ignore.
Sources:
Thousands told to evacuate flooding in Hawaii; aging dam could fail
Over 5,500 told to evacuate flooding in Hawaii; 120-year-old dam could fail
