A large rock face along Mamalahoa Highway on the Big Island will be cut back and partially removed by the county to prevent future rock falls on the South Kona stretch of road.

Located at mile post 110.3, just south of the Napo'opo'o Junction, the 20- to 30-foot face will be cut back starting today, according to Bruce McClure, director of the Hawai'i County Department of Public Works.

A study conducted in June recommended removing sections of the rock face to stabilize the area and prevent smaller rocks from falling on the north-bound lane of Mamalahoa Highway, McClure said.

The rubble generated from this work will be used as "fill" for the future realignment of Napo'opo'o Junction, he added.

The roadwork is planned for Saturdays and Sundays until the end of September, between 7 a.m. and 7 p.m.

McClure warned that residents in the immediate vicinity may hear hammering as the rock is broken up for removal.

Completion of the work is scheduled for Sept. 30.

Motorists should plan on delays while the work is under way, perhaps for up to 30 minutes.

It is recommended that motorists traveling to Honaunau and beyond take Napo'opo'o Road to Middle Ke'ei Road, avoiding the area where the work is taking place.

For updated information on this roadwork and other projects on the Big Island, call the 24-hour hotline at 808-334-9559.