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.
Section of Mountain Rd now open with temporary 40mph speed limit
The Mountain Road has now reopened to traffic.
Ballamodha Rd closed until 9pm between South Barrule & Bayrauyr Junction due to RTC
Roads in the area of Ballamodha will remain closed until 9pm tonight due to a serious road traffic collision.
Ballaugh Bridge now open following RTC
Ballaugh Bridge has now reopened to traffic following a road traffic collision earlier today.
RTC in area of Ballamodha
Police have received information about a road traffic collision in the area of Ballamodha.
Mayoral Appeal donates £3,000 to local causes
A charity appeal run by the Mayoress of Douglas has raised £3,000.
Man who tried to steal clothes worth £660 appears in Court
A thief who attempted to steal clothes worth hundreds of pounds from Sports Direct has narrowly avoided prison.
Johnston says Tesco is continuing local charity support
Enterprise Minister Tim Johnston says Tesco is continuing to support the Island as it converts former Shoprite stores.
Sock it to us, says vet!
Do you have any tiny socks spare to keep a kitty's paws warm during surgery?
