A passenger-only service will be in place on the ferry route between Mull and Morvern while work takes place at Lochaline.
Caledonian Maritime Assets Ltd (CMAL) is upgrading the slipway.
CalMac will operate a passenger only service from October 21 to December 1 using the Wood Pier in Lochaline. For the duration of the project Shiel Buses will extend their route from the existing slipway to the temporary embarkation point.
All vehicle traffic to Mull will be diverted via the Oban/Craignure and Kilchoan/Tobermory crossings while the work takes place.
CalMac head of service delivery Robert Morrison said: “Several options were looked at to continue to provide a service during the closure and the Wood Pier alternative was deemed to be the one that provided the best continuity of service.
“It continues to deliver a service from the local area for regular travellers and has onsite parking for passengers.”
The upgrade work includes the removal of the old structure and the construction of a new one, as well as improving the overnight ferry berth at the terminal. Extra marshalling space will be created and the project will also see the existing slipway widened and lengthened, and the berth area deepened.
To help ease the extra burden for local businesses during the disruption, commercial vehicles will be charged at the cheaper Lochaline/Fishnish rate for the longer crossing from Oban to Craignure.
