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Lake Havasu City says HA5 sealant improving pavements but requires 24-hour closures
Summary
City officials described temporary 24-hour lane closures while crews apply a road sealant product called HA5 (vendor Holbrook Asphalt), and urged patience as the work finishes in days. Officials said weather windows limit application to brief periods in spring and fall.
Lake Havasu City officials warned residents April 4 that a road-sealing product known in the meeting as “HA5,” supplied by Holbrook Asphalt, will continue to require temporary full-lane closures while it cures.
Mayor Cal Sheehy and City Manager Jessica Newton said the treatment is being applied after recent asphalt work to extend pavement life. “We spray it and you can't touch it for 24 hours,” Newton said, describing the contractor practice of closing a treated stretch for a full day to allow the surface to cure.
The city framed the work as a trade-off: short-term traffic disruption for longer pavement life and fewer chip-seal streets. Sheehy said the pavement looks “really great” when the work is finished and that staff are evaluating alternative products with shorter cure times to reduce future closures.
Newton explained the timing is weather-dependent. “Temperatures are very, very important when we lay down the treatments…We could not spray the HA5 on Tuesday this week because the temperatures were too cool, and the product would not cure properly,” she said. Staff said ideal windows occur in a few weeks in spring and again in fall, meaning the work can be concentrated but also sensitive to single-day temperature changes.
The city also described traffic-control strategies during treatment, including lane splits and cone-controlled travels lanes to keep businesses and residents accessible during work. Separately, Sheehy noted a recent traffic-control change on Riviera (between South Palo Verde and Mesquite) intended to improve egress from neighborhoods along Pima.
City staff asked drivers to exercise caution around active work zones and said crews expect the current round of HA5 applications to wrap up in the next several days. The city will continue evaluating alternatives to reduce cure time and the length of road closures.
Officials did not announce a final schedule of streets or a supplier change; residents were encouraged to watch city announcements for timing and detour information.
