Improvements to a stream that runs through Pulrose will mean road closures for up to 12 weeks.
The Department of Infrastructure says it needs to prepare culverts for Farmhill Stream, which runs under Groves Road to the River Dhoo.
The DOI says flood risks show work's needed to prevent flooding at the National Sports Centre in extreme weather events.
As a result, part of Groves Road will close on November 7 and reopen when the work is finished at the end of January.
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night
Mountain Road unlikely to open before Monday
Yellow warning for freezing temperatures tonight
School bangers night called off
AK47 and Uzi handed in to police
"No dispute" over Liverpool Ferry Terminal, says main contractor