Evacuations are underway in parts of Oahu, Hawaii, as officials warn of the potential for catastrophic failure of the Wahiawa Dam amid ongoing, intense rainfall. More than 4,000 residents in the towns of Waialua and Haleiwa were ordered to evacuate Thursday morning local time, as water flowed over the dam’s spillway and local flooding already impacted the area. The situation underscores the vulnerability of aging infrastructure in the face of increasingly severe weather events.
The Wahiawa Dam, built in 1906 and owned by Dole Food Company, holds back approximately 9,200 acre-feet of water – equivalent to roughly 4,600 Olympic-sized swimming pools. Even as streamflow gauges indicated water levels were falling at the dam by Friday afternoon, authorities cautioned that further rainfall could quickly change the situation. The potential for failure remains a serious threat, particularly with additional storms forecast to impact the island.
Hawaii Governor Josh Green urged residents in the evacuation zones to heed the warnings and leave immediately. “If you are in these areas, please evacuate now,” Green said in a statement. State offices and departments were closed Friday, with the exception of emergency management personnel, to allow families to focus on safety. The immediate concern is the potential for a sudden and devastating release of water, which could inundate downstream communities.
Dam’s Condition and History of Concerns
The Wahiawa Dam has been the subject of scrutiny for years. A 2020 inspection by Hawaii’s Department of Land and Natural Resources deemed the dam to be in “poor” condition. A 2024 letter from the state’s chief engineer, Carty Chang, highlighted the dam’s undersized spillway, stating it “may not be able to pass the Probable Flood,” potentially leading to water overtopping the embankment and a subsequent failure. The letter estimated that around 2,500 people would be at risk if the dam were to fail.
The state has been in discussions with Dole Food Company for several years regarding the acquisition of the dam, but a deal has not yet been finalized. William Goldfield, director of corporate communications for Dole, stated in an email that the company “is working closely with authorities and continues to monitor the reservoirs including Lake Wilson,” prioritizing public safety. Goldfield added that “the dam continues to operate as designed with no indications of damage.” Still, the dam’s age and documented deficiencies raise serious questions about its ability to withstand extreme weather events.
Recent Rainfall and Flood Impacts
The current crisis follows a week of intense rainfall across the Hawaiian Islands. More than 5 feet of rain fell in some parts of Maui between March 10 and 16 during a “kona storm,” a weather pattern characterized by southerly winds and heavy precipitation. This recent deluge saturated the ground, reducing its capacity to absorb further rainfall. Stephen Parker, a meteorologist with the National Weather Service (NWS) in Honolulu, reported that Oahu has received 8 to 12 inches of rain in the last 12 to 16 hours, leading to widespread flooding.
The flooding has already caused significant disruption. Nate Serota, a spokesperson for the Honolulu Department of Parks and Recreation, confirmed multiple reports of flooded roadways in Waialua and Haleiwa, with high-clearance vehicles deployed to rescue stranded individuals. Social media footage depicts submerged cars and residents wading through flooded streets. A home in Mokuleia, on Oahu’s north shore, was reportedly washed away overnight, highlighting the severity of the situation.
Looking Ahead: Continued Flood Watch and Monitoring
The NWS has issued a flood watch for Oahu through Sunday, with the possibility of additional rainfall. Parker cautioned that even though streamflow gauges showed decreasing water levels at the Wahiawa Dam on Friday afternoon, “if we were to get a big dose tonight, it would reinvigorate that threat.” The situation remains fluid and dependent on future weather patterns.
Authorities are closely monitoring the dam’s condition and providing updates to the public. Residents in the evacuation zones are encouraged to stay informed through official channels, including the Oahu Department of Emergency Management and local news outlets. The potential for dam failure underscores the urgent need for infrastructure improvements and proactive disaster preparedness in the face of a changing climate.
The extreme weather in Hawaii is occurring alongside a period of unusual weather patterns across the continental United States. California and the desert Southwest are experiencing a severe heat wave, with Lake Martinez in Arizona reaching a record 110 degrees Fahrenheit on Thursday. Meanwhile, the Midwest has been grappling with heavy snowfall and Nebraska’s worst wildfire in state history. This confluence of extreme events highlights the increasing frequency and intensity of climate-related disasters.
Officials will continue to assess the situation at the Wahiawa Dam and provide updates as they become available. Residents are urged to remain vigilant and follow the guidance of emergency management officials. Further information and evacuation details can be found on the Oahu Department of Emergency Management website.
This is a developing story. We will continue to provide updates as more information becomes available. Share your experiences and concerns in the comments below.
