Knock Bridge, B8035 Mull

Update Details
Opening to traffic between phases of work (19/05/17)

There are now no anticipated openings to vehicles between phases until the scheduled end date of the strengthening works (currently 17th June).

Knock Bridge is currently closed until late June 

Knock Bridge is currently closed to vehicles until late June to allow strengthening works to be carried out.

View the Temporary Prohibition of Traffic Order

The remaining stages of the programme of work are as follows:

  • Knock Bridge closed to traffic until completion of works – currently anticipated to be late June.  *Please see note below regarding pedestrian access.

  • Late May until Mid-June – Ties installed by specialist contractor. Alongside this, there will be further work carried our by masons to the bridge.

  • Late June - Road surfacing reinstated and soft verges rebuilt where cars have been parking near the bridge.

  • End of June – Knock Bridge reopened to traffic at previous 33t capacity. (Currently anticipated to be Saturday 17th June)

Pedestrian Access

Pedestrians & pedal cyclists on foot will be accommodated whenever it is safe to do so throughout the works.  Pedestrian access will be managed in the same way as during the previous bridge closure in February.  Any cyclists wishing to cross Knock Bridge will be able to dismount and walk their bikes over.  Any unsafe-to-cross periods will be kept to a minimum and we do not anticipate any long periods when the bridge cannot be crossed at any point during the works.  The previous closure did not involve any long periods and whilst the works are for the entire bridge this time, the section repaired in February required more intensive repairs than the sections being repaired this time.  If anything unforeseen happens during the works that would affect pedestrian access in any way, this page will be updated immediately.

 

Vehicle access during the works

Pedestrian access is being maintained at all possible times, whenever it is safe to do so.  Unfortunately vehicular access cannot be maintained whilst works are underway due to the narrow width of the bridge.  A temporary vehicle bridge has been considered, but would incur too long a delay to the urgent work.   Ground Investigations would have to be undertaken to determine the requirements for any form of temporary bridge and its accompanying abutments and road approaches.  Following this, planning approval would then be required before proceeding with a tender process and extensive construction period.

At any opportunities between phases of work, we will endeavour to open the bridge to light traffic if safe to do so.  So far, no safe opportunities have arisen.  As mentioned above, it appears no further opportunities will occur, but this page will be updtaed if any opportunities do arise.

Argyll & Bute Council are working to achieve the best outcome for the area, with Knock Bridge’s capacity being returned to 33t as soon as possible.

Reduced Weight Restriction Prior to Strengthening Works

Prior to this closure, the B8035 from its junction with the A848 in Salen to the entrance of Balmeanach Farm had a weight restriction of 33 Tonnes Maximum Gross Weight (MGW).  From the entrance of Balmeanach Farm to the B8035/A849 junction the weight restriction is reduced to 18 Tonnes MGW.  Following a recent bridge inspection, Knock Bridge was reduced from a 33 Tonne MGW to a 7.5 Tonne MGW weight restriction, which was causing some local issues in regards to the transfer of goods by road.

Knock Bridge is a 13m single span masonry arch dating from the 18th Century and is a Category B Listed Building.  The bridge was in poor condition due to overloading and although limited remedial works were completed, the bridge was still showing significant distress and for this reason it was considered that a7.5T MGW temporary weight restriction was appropriate.

The 18T MGW weight restriction is in place over a weak section of the B8035.  Timber haulage operations have been suspended on this section of road due to significant damage to the carriageway.  The Traffic Regulation Order “The Argyll and But Council (various Roads, Isle of Mull) (Weight and Length Restrictions) Amendments Order 2011” allows users to request an exemption to the MGW weight restriction through the issue of permits by ABC.  It is important to note that the permit system still only allows the maximum weight of the restriction to be carried over a route, for example, a vehicle with a tare (empty) weight of 10T may carry a load up to 8T over a route with an 18T limit (tare weight + load).

The Council are aware that the current situation is causing some difficulties among the users of the B8035 and the current strengthening works will allow this section of the road to be reopened at the previous 33t mgw restriction.  We would like to remind users that they should be aware that it is an offence to breach the weight restrictions.