The Department of Infrastructure says Laxey Promenade is now closed.
Coastal overtopping means it's been forced to shut the route for safety reasons.
It says it'll reopen as soon as it can after the high tide has receded.
Mooragh Promenade and Queens Promenade in Ramsey are both shut as waves wash over the sea wall.
Thomas the Ramsey Cat supporting two charities this year
Waves blast out Sea Terminal glass barriers
Southern local authority announces below-inflation rates rise
Ramsey roads shut because of coastal overtopping
MHK writes to Post Office about bill-paying restrictions
£7.7m cost by Manx Care staff sickness
30.5% hike to rates in Andreas
Only some war pensions discounted from care charges