Motorist on Arran will face delays to their journeys and will need to use diversionary routes until the end of the month as workers repair and rebuild the Allt Mor bridge on the String road.
The bridge, which dates back to 1879, had been showing signs of wear, and closer inspection last month by North Ayrshire Council’s roads team revealed the urgent need for an extensive rebuild.
Originally a single track bridge, but widened to accommodate two vehicles some time in the last century, the weight of traffic and the passage of time had taken their toll on the structure, resulting in the bridge developing faults on the older, downhill side.
As part of the remedial works the whole of the upper bridge structure has been removed down to the foundational arch so that steel tie rods can be inserted crosswise into the span, deep under the surface of the road. Once in place, wall anchors will be placed outside the walls on the tie rods to brace the downhill face of the bridge.
To allow for the repairs, the String road closed at 8am on Monday April 8 and will remain completely closed until 6pm on Friday May 1. The bridge is impassable to all vehicles and even vehicles associated with the work are needing to be located on either side of the bridge to complete the next stage of the process.
Any traffic wishing to cross between the east and west sides of the island during this time must divert either via the Ross road, the north end or the south end. The signposted diversion uses the north end road from Blackwaterfoot to Brodick, avoiding the easily congested single track Machrie Moor road.
Motorists needing to traverse across the island are having to plan their journeys and factor in additional travelling time since the diversion can quadruple the usual 15 minute journey time between Brodick and Blackwaterfoot. When travelling by car, the diversionary route can take approximately one hour for the north end route, 50 minutes for the south end route and 45 minutes if traffic is favourable on the single-track Ross road.
The bridge repair was originally scheduled for later in the month, however, it was postponed owing to concerns about Arran High School exams that are taking place. The rescheduled works means that only students undertaking geography, biology, music and English exams will be affected. If the bridge repairs are finished in the forecast timescale, school bus journey times should return to normal for exams scheduled in May.
James Mcfarlane, roads technician for North Ayrshire Council, explained that a full road closure is necessary for this type of repair. He said: “Due to the nature of [the bridge repairs], legislation requires that in the interest of safety, this restriction must be put in place for the works duration.”
“North Ayrshire Council neighbourhood services would like to thank you for your patience in this matter” he added.
Updates on road closures on Arran can be found online at north-ayrshire.gov.uk/roads-and-parking/roadworks-and-road-closures
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