Concerns Rise Over Wahiawa Dam Amid Kona Low Weather System

The Wahiawa Dam in Oahu is currently under intense scrutiny due to the Kona low weather system, which has led to a Flash Flood Warning and evacuation orders for nearby communities. Although officials have confirmed that the dam has not failed, they continue to monitor water levels closely as they fluctuate. With persistent rainfall expected, emergency crews are on high alert, ensuring the safety of residents and the integrity of the dam. This article delves into the current situation, the measures being taken, and the significance of the Wahiawa Dam in managing water resources on the island.

By Narendra Chaudhary Mar 21, 2026, 04:14 IST

Intensifying Weather Conditions on Oahu

The Kona low weather system affecting Hawaii has heightened worries on Oahu, particularly regarding the Wahiawa Dam, which is currently under strict observation due to a Flash Flood Warning and ongoing evacuation orders for certain areas of the North Shore. As of 9 a.m. on Friday, March 20, officials confirmed that the dam has not experienced a failure, despite overnight concerns. Evacuation orders remain active for communities downstream, including Haleiwa and Waialua, as teams assess the evolving situation at Lake Wilson.

Trisha Kehaulani Watson from Houa Consulting, representing the dam's owner, clarified the current status: “The dam has not failed.” She explained that water levels have been managed through the spillway, likening it to an overflow drain in a bathtub, which helps control excess water.

Ongoing Monitoring and Safety Measures

Water Levels Decline, Yet Caution is Advised

Initially, water levels exceeded 85 feet, prompting mandatory evacuations. However, they have since decreased slightly and are now below that critical level. Despite this improvement, officials continue to advise caution as conditions remain unstable. Watson mentioned that an aqua dam was installed last week to provide additional support to the structure.

Persistent rainfall associated with the Kona low is still exerting pressure on the dam. Multiple watersheds are contributing to Lake Wilson, which raises concerns about the ongoing stress on the dam and adjacent waterways. “There is a significant amount of water entering,” Watson remarked, emphasizing the volume and speed of runoff into the reservoir.

Emergency response teams are fully engaged, ensuring constant monitoring and coordination with local authorities. Officials reiterated that surveillance is continuous, with teams observing the dam at all times. “There are personnel monitoring Lake Wilson around the clock,” Watson stated, noting that inspections are thorough and consistent.

Residents are urged to adhere to evacuation orders and follow law enforcement guidance. “Take your evacuation orders seriously,” Watson emphasized, highlighting the importance of prompt action as weather conditions change. For the moment, the dam remains secure, but with more rain anticipated, officials are prioritizing safety and readiness.

Understanding the Wahiawa Dam

Wahiawa Dam Overview

The Wahiawa Dam, also referred to as Lake Wilson Dam, is located in Oahu's central valley at the Lake Wilson reservoir. It is positioned just downstream from where the north and south forks of the Kaukonahua Stream meet, approximately 7 miles from Waialua. This earthen dam creates Lake Wilson, one of the island's major inland water bodies, with a capacity exceeding 3 billion gallons. The reservoir features a shoreline of about 20 miles and a maximum surface area of roughly 350 acres, underscoring the significant volume of water held behind the dam, which necessitates close monitoring during heavy rainfall and increased inflow.