Construction Updates – Current as of September 26, 2020



  • In August of 2018, construction crews re-striped and re-aligned H1 along the project extents to provide access for shoulder widening and concrete paving tasks.
  • Primary construction activities began in September 2019 in “Increment #1” which is located on the East end of the Waimalu Viaduct. The general construction sequence for all increments is as follows:
    • Install environmental controls – Dust fence, run-off protection, etc.
    • Remove existing street lighting
    • Slope excavation – Removing material from the slope to allow for shoulder widening
    • Wall excavation & backfill – Includes two Cast-in-Place concrete walls and two Mechanically Stabilized Earth (MSE) walls
    • Install new street lighting
    • Install utilities – Drainage and Waterlines where applicable
    • Prepare shoulder for paving – Leveling and compacting roadway subgrade
    • Concrete paving – 11 total paves starting Friday morning(s), finishing by Saturday morning.
    • Install drainage swales
    • Permanent landscaping – Reseeding slopes and installing erosion control matting
    • Install guardrail and signage


  • Slope excavation
    • Completed in Increments 1-5 as of Summer 2019.
  • Highway Lighting System
    • Pole foundations and conduit installation is approximately 90% complete.
    • Installation of permanent street light poles will be complete in Summer 2019
  • Wall #1 (Cast-in-Place, located beneath the Ka’onohi St. Overpass)
    • Completed on December 14th, 2018.
  • Wall #2 (MSE, located ~500ft East of the Kaonohi St. Overpass)
    • Completed on March 19th, 2019
  • Wall #3 (MSE, located ~250ft West of the Kaamilo St. Overpass)
    • Completed on April 1st, 2019
  • Wall #4 (Cast-in-Place, located beneath the Ka’amilo St. Overpass)
    • Wall footing was poured on July 27th, 2019. Wall 4 is expected to be complete by the end of Summer 2019
  • Concrete Paving
    • Currently, paves are scheduled to occur on Friday nights only.  Lane closures will start at 10:00 AM on Friday mornings (one lane + shoulder) for demolition and expand to three lanes + shoulder by 7:30 PM Friday night.  All lanes except the shoulder will re-open by 7:30 AM on Saturday morning.  The shoulder lane will remain closed until 4:00 AM on Monday morning to allow for proper pavement curing.  Closure days and times are subject to change pending field conditions and/or weather.  All closures will continue to be communicated in the “Traffic” section of the website.
    • 9 of 11 paves have been completed to-date.  Concrete paving will continue through Summer 2019.
  • Landscaping
    • Cut slopes in Increments 1, 2 & 3 have been permanently stabilized. Cut slopes in increments 4 & 5 will be permanently stabilized by Fall 2019
  • Phase 2 construction activities will be complete in Winter 2019.


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