Statement from Comhairle nan Eilean Siar, 5th November 2020
The bridge to Bernera was constructed in 1952/53 utilising post tensioned concrete technology, which was an emerging advancement in structural engineering. There is specific inspection guidance for this type of bridge which, based on a risk assessment process, may require an intrusive survey (cutting into the concrete structure to expose the steel tendons for inspection). Bernera Bridge was intrusively inspected in 1998, following collapse of a similar structure, and was found to be structurally sound. Due to the intrusive nature of this type of survey a period of eighteen years is the recommended timescale between such surveys. A principle inspection on the bridge in February 2020 revealed structural cracking which recommended the commissioning of a further intrusive survey. This subsequent survey confirmed that the bridge had deteriorated to the extent that it was necessary to implement a 7.5 tonne weight restriction with immediate effect.
In 1998 protective works were undertaken to the deck structure therefore, based on the previous inspection report, the deterioration identified in 2020 was much more significant than expected, and not reasonably foreseen.
Since the introduction of the weight restriction the Comhairle has been focused on ensuring that services associated with the health, safety and welfare of residents are facilitated. Emergency services and utility providers have contingency plans for working around the weight restriction. Fuel providers have also been collaborative in arranging for alternative means of maintaining supplies.
Enquiries have been made in relation to materials and equipment for construction projects. Although the Comhairle would be happy to discuss specific one-off deliveries unfortunately sustaining the level of resources required for a complete house build would not be practical.
The sea crossing trial, which would also provide for fuel deliveries, has proven difficult to deploy due to weather conditions. It is, however, hoped to get this to happen in the coming week.
An alternative vessel provider, who is currently working in the area, was approached with a view to undertaking this crossing, however the appropriate certification for carrying dangerous goods (tankered fuel) is not in place for the vessel (MV James).
Should the transport of gas not be possible next week then alternative bottled gas conversions will be considered for those affected. The Scottish Salmon Company has been assisting the Comhairle with facilitating landings. Ferguson Marine and O’Malley Marine Plant have been in discussions in facilitating a suitable vessel for the proposed sailings.
Meantime progress is being made in the procurement of a replacement bridge structure. Although being referred to as temporary, the structure will have a minimum design life of 30 years. The normal design life for such a structure would be 120 years.
The Marine Licence application has been accepted and a 28 day public consultation will commence within the next few days. The amount of work that is required pre application is considerable, and in this case has resulted in a fast track approach by Marine Scotland.
A planning application has been submitted and awaiting determination. Land acquisition is in progress with both estates.
It is hoped that the necessary approvals and land acquisitions will be concluded by December 2020 allowing a start on site immediately thereafter. Within this anticipated timescale completion of the new crossing will be in March/April 2021. The Comhairle appreciate the difficulties this restriction is causing for the residents of Bernera and values the continued support of the community. A plan of the prospective works can be found here.