Full Breakdown
Rockfall Closes Kamehameha Highway at Waimea Bay
4/12/2026, 8:56:47 AM
Incident Overview
On April 10, 2026, at approximately 1:30 p.m., two large boulders, each the size of a car, fell onto Kamehameha Highway near Waimea Bay, resulting in the complete closure of the roadway. The boulders originated from a mountainside, blocking traffic and raising safety concerns due to the proximity of a 24-inch water main beneath the highway. The Hawaii Department of Transportation (HDOT) reported that the fallen rocks knocked down trees and posed additional risks from loose material on the slope.
Response and Cleanup Efforts
Following the incident, HDOT initiated cleanup operations, which included breaking down the boulders into smaller pieces for removal and conducting rock scaling to eliminate any additional loose debris from the slope. Transportation Director Ed Sniffen emphasized the unpredictability of rockfalls, stating, “You never know where it’s going to come through.” Crews worked to stabilize the mountainside and ensure that no further debris would pose a threat to motorists.
As part of the response, HDOT placed steel plates on the highway to protect the waterline from potential rock impacts. The agency also implemented a contraflow traffic system, allowing for a single lane to reopen on April 11, 2026, at 2:30 p.m. with alternating traffic managed by flaggers. The single-lane closure spans a 750-foot section of the highway, and intermittent traffic holds may occur as additional rock scaling continues.
Long-Term Mitigation Measures
HDOT is planning to install a permanent rockfall protection system, which is estimated to cost $20 million and will take three to four months to complete. This system aims to prevent future rockfalls from affecting the roadway. The department is coordinating with the State Historic Preservation Division to ensure that cultural resources in the construction area are protected during this process.
Official Statements & Responses
In response to the incident, HDOT officials have assured the public that safety is the top priority. They are conducting thorough inspections of the highway and surrounding slopes before allowing full access. Sniffen noted, “Anytime something like this comes down, we know that there’s other loose material up above. We’ve got to make sure it doesn’t fall on anybody.”
Criticism & Opposition
While no injuries or vehicle damages were reported, some local residents expressed concerns about the frequency of rockfalls in the area, questioning the adequacy of existing safety measures. They called for more proactive measures to address the risks posed by the mountainous terrain along Kamehameha Highway.
What's Next
As cleanup and stabilization efforts continue, HDOT will provide updates on the progress of the rockfall protection system and any further road closures that may be necessary. Motorists are advised to avoid the area until it is deemed safe for travel.
