Work is taking place at South Barrule Plantation to remove storm damaged trees.
DEFA expects the work to take several months to complete, with fencing and public notices in place to show any diversions or restrictions.
The department said it's aiming to keep the main forest roads open, but some restrictions will apply at times.
The Viking mountain bike trail will be closed throughout the works.
South Barrule's outdoor activity businesses will operate as normal.
Bus Vannin gives update on staffing problems and routes affected today
Bus Vannin has revealed more details about buses which may not run today.
Toilets vandalised for fourth time in a month
Commissioners in the west of the Island are appealing for help catching those who vandalised toilets this week.
Poppy gets fur-ever home after sparking rescue operation in Douglas
A tiny Manx kitten who was rescued in Douglas city centre has been given a happy ending.
Council gets eight complaints about James Brown in six months
Douglas Council says a newly-built block of flats in Willaston has seen eight reports of antisocial behaviour in the six months since tenants moved in.
More bus staffing problems this weekend
Bus Vannin is warning of more problems with its services this weekend.
Manx community spirit shines through during Island storms
A motorist has been praised for going above and beyond to help others after a tree came crashing down during Saturday's storms.
Free period products law receives Royal Assent
Free period products are set to become more accessible on the Isle of Man following the announcement of Royal Assent at Tynwald earlier this month.
How are Islanders supported while waiting for benefits?
A Peel MHK will ask about help for those whose benefits claims are still being processed.
