The Maughold section of of a public right of way is to be closed off until December.
The section of PROW 103 comes off the lower reaches of Snaefell and links to the Ramsey to Laxey Coast Road at Glen Mona.
It is subject to an emergency closure after last month’s storms caused “significant washout”, said a spokesman for the Department of Infrastructure.
“The route has been assessed as being unsafe for public rights of way users.”
Discussions will take place with government’s hills, forestry and glens section to “assess what can be done to alleviate the risk of further damage from flood water”.
However, the DoI is warning that the emergency closure, which lasts until December 4, is likely to be extended.