The Department of Infrastructure says a section of the TT course will close for two weeks from Monday.
Drainage and resurfacing works means Creg Willey's Hill will shut between Ballig Bridge and Cronk Y Voddy from 9.30am on Monday, March 17.
The DOI says TT organiser ACU Events described the work as essential for this year's racing - because water could seep onto the road and create a race hazard.
Traffic will be diverted via Poortown Road.
Info sessions on fostering this week
Government to keep an eye on inflation, says Cannan
Manx Care pauses all non-emergency procedures
Capital's lifeboat set to get new home
Government releases DEI hiring info
Canadian sign points out triskele is "NOT A SWASTIKA"
Belgian TV travel show needs ride around the TT course!
Road in Ballabeg to remain shut until this afternoon, say police