The Hawaiʻi Department of Transportation is working on several construction projects on the H-1 and H-201 Moanalua Freeways. Nighttime closures and detours will occur, especially on weeknights and weekends. The H-1 Pearl City and Waimalu Viaduct improvements involve eastbound deck demolition and concrete work from 7 p.m. to 4:30 a.m. on weeknights, with longer hours on weekends, and are expected to be completed by March 2027. The H-1 Salt Lake Rehabilitation project has experienced delays, with eastbound closures from 8 p.m. Friday to 2:30 a.m. Monday, and westbound closures from 6:30 p.m. to 2:30 a.m. Monday. This project is now set to finish by June 2025 due to 203 days lost to weather, according to the Hawaiʻi Department of Transportation.
Nightly work on the Airport Viaduct improvements on the H-1 Freeway, between Valkenburg Street and the Middle Street merge, will continue, excluding Mondays. The completion date is now August 2025, delayed from June 2025 due to high traffic use. Widening and retaining wall work will result in shoulder closures Monday through Friday nights, affecting the H-201 Moanalua Freeway on-ramp. This work is expected to finish by July 2025, with the full Eastbound H-1 Freeway Improvements Project expected to be completed by March 2027, weather permitting. Overnight closures for a temporary pedestrian bridge installation over Gulick Avenue are planned for September 2025, as reported by the Hawaiʻi Department of Transportation.
The H-201 Moanalua Freeway resurfacing project will have full westbound closures between Middle Street and the Kaua Street on-ramp Sunday through Friday evenings. The project, initially delayed by 20 days due to weather, is expected to finish this section by May 30, with the overall completion set for November 2025. Drivers are encouraged to check the Hawaiʻi Department of Transportation website for updates on road conditions, safety measures, and lane closures, and can sign up for weekly notifications. Completion dates may change due to weather or other factors, as stated by the Hawaiʻi Department of Transportation.
