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Highland Council to find extra £3.1M for Stromeferry and Kinloch Hourn stabilisation

Members of the Highland Council are to be asked to find an additional £2.185M for rock stabilisation works at Stromeferry and £0.925M for stabilisation works as a result of a landslip at Kinloch Hourn.

In a report to go in front of the Environment Development and Infrastructure committee later this week, the Highland Council will detail the additional funds that are needed to stabilise both areas.

At the A890 Stromeferry Bypass, Trac Engineering undertook remediation work which was completed in November. This included the installation of 240 rock anchors with an active netting system draped over parts of the rock face and a concrete buttress was created on a small section to support an overhanging rock face close to road level.

The Highland Council had identified four very high risk slopes to be prioritised. Two slopes will require upslope catch fencing measures and ground investigations are planned to begin in the autumn of this year.

It is anticipated that construction work will begin in the spring of 2020 with a budget estimate of £2.7M. 

Due to the location and nature of the works it is likely that the council will use a road onto rail solution - where rail signals give the traffic more time to cross the railway to ease congestion - will again be adopted for one of the slopes.

For Kinlock Hourn, the 1km slope failure near Invergarry on 10 November knocked out the power supply to the Isle of Skye and the Western Isles, deposited 9,000t of material into the dam spillway, forcing power station operations to be stopped.

In November the Highland Council reported that Mott MacDonald geotechnical engineers have categorised the area of the slip as very high risk which prevents any attempt to clear debris from the road under the large loose material on the slope above. This material must be stabilised first.

The road is expected to re-open in the middle of this year and the extra 0.925M funding will be used over the next two years for the remedial works.

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