Skyline Segment 3 Construction Rises Along Iwilei and Downtown — What to Expect Through 2026

Concrete columns are rising across Iwilei and Downtown Honolulu as construction crews push forward on the most complex segment of the city’s rail transit system. The Skyline’s third segment, stretching from Kalihi to the Civic Center, will add six stations to the elevated guideway when it opens in late 2025.

Crews from Tutor Perini are now pouring foundations and erecting the massive concrete columns that will support the rail line as it threads through some of Oahu’s most congested neighborhoods. The work is most visible along Dillingham Boulevard, where utility relocations are scheduled to wrap up by the end of this year.

“We’re seeing real progress on what’s arguably the most challenging part of this entire project,” said Lori Kahikina, executive director of the Honolulu Authority for Rapid Transportation. “Threading an elevated rail line through Downtown and Chinatown requires precision engineering and careful coordination with existing infrastructure.”

The City Center segment will connect six stations: Kalihi, Kapalama, N. King Street, Iwilei, Downtown, and Civic Center. Each station represents a major transit hub designed to serve dense residential and commercial areas that currently rely heavily on bus connections and personal vehicles.

Traffic Impacts Through 2026

Drivers should expect ongoing lane restrictions along key corridors through 2026. Dillingham Boulevard continues to see periodic closures for utility work and column construction, with most activity scheduled during overnight hours to minimize disruption.

Downtown Honolulu faces the most complex construction challenges, as crews work around existing buildings, underground utilities, and the busy harbor area. The elevated guideway will run along Halekauwila Street before turning toward the state capitol complex.

Construction noise and dust remain ongoing concerns for residents and businesses in Kalihi and Iwilei. HART has implemented sound barriers and water spraying to control dust, but the industrial-scale construction continues to test community patience.

Ridership Projections

HART projects the completed City Center segment will serve approximately 9,200 passengers daily by the first quarter of 2026. That figure represents a significant jump from current ridership on the West Oahu segment, which launched service between East Kapolei and Halawa in June 2023.

The Downtown and Civic Center stations are expected to be the system’s busiest stops, serving government workers, tourists, and residents connecting to TheBus routes throughout urban Honolulu. The Iwilei station will provide crucial access to Costco, Sam’s Club, and the growing residential towers in the area.

Transit officials acknowledge that ridership projections depend heavily on successful integration with existing bus routes and adequate parking at stations. Park-and-ride facilities are planned for several stops, though capacity remains limited in the urban core.

Engineering Challenges

The City Center segment poses unique engineering obstacles not faced in West Oahu’s suburban corridor. Crews must work around century-old buildings in Chinatown, navigate complex underground utility networks, and maintain access to Honolulu Harbor operations.

The elevated guideway reaches its lowest point near sea level in Downtown, requiring extensive foundation work in areas with high groundwater. Crews have been working with specialized equipment to ensure structural integrity in the marine environment.

Archaeological monitoring continues throughout construction, as crews occasionally uncover artifacts from Honolulu’s plantation era and early statehood period. State preservation officials review any significant finds, though delays have been minimal.

What’s Next

HART expects to complete guideway construction through Downtown by mid-2024, followed by installation of electrical systems and rail infrastructure through 2025. Testing will begin in late 2025, with passenger service targeted for early 2026.

The completion of Segment 3 will create a continuous rail connection from Kapolei to Downtown Honolulu, finally delivering on the system’s promise to provide meaningful transit alternatives for Oahu commuters. For residents tired of H-1 freeway gridlock, that connection can’t come soon enough.

Beyond 2026, HART continues planning for the final segment to Ala Moana Center, though funding and timeline remain uncertain. The City Center segment represents the rail system’s make-or-break moment — proving whether elevated transit can successfully serve urban Honolulu’s complex transportation needs.