This week, Leeward Coast drivers heading town-bound at night should expect some delays: Roadwork will close a stretch of the eastbound H-1 freeway in Kapolei, officials say.

The work, to relocate a waterline, will close one lane between the Campbell Industrial Park/Barbers Point Harbor offramp and Farrington Highway overpass from 8:30 to 9 p.m., and then fully close the eastbound freeway there from 9 p.m. to 4:30 a.m., according to the state Department of Transportation.

The closures began Monday night and are scheduled through Friday morning, weather permitting, according to a DOT release.

“Closing down that section will cause an impact … during those times” to traffic, DOT spokesman Tim Sakahara said Monday. But it’s “work that needs to be done,” he said, adding, “These are the lowest-volume hours out of the 24 hours in the day.”

Sakahara encouraged drivers to plan ahead to deal with the impact.

During the full closure, eastbound traffic will be directed off the freeway at the Campbell Industrial Park offramp (exit 1A). From there, drivers can take Kalaeloa Boulevard to Kapolei Parkway, turn left onto Kamokila Boulevard and turn left again on Wakea Street to get back on the freeway, according to the DOT.

Crews are moving the waterline so they can eventually make improvements to the freeway interchange there — work that will require further closures, Sakahara said. He did not have any immediate details on when the subsequent interchange work would start.