|Distance:||18.8 miles (30.3 km)|
|Meets:||A872, B822, A875|
|Old route now:||A883|
|Route outline (key)|
The B818 is a a long B-road in south Stirlingshire, crossing the Campsie Fells by using the valleys of the River Carron in the East and the Endrick Water in the west.
It starts on the A872 on the western side of Denny. This section of the A872 is relatively new, forming a relief road for the town centre, and along with the M80 has caused the realignment of this section of the B818. Previously starting at the further end of Duke Street, the route crossed the Castlerankie Burn a little further downstream, now the site of a pedestrian bridge. It then followed the surviving stretch of Duke Street to the junction with Grove Street, where it turned due west under the motorway.
The new road runs a little to the south and crosses parkland before going under the M80, which sits on an embankment across the Carron Valley. The B818 then follows the valley of the River Carron upstream, passing through the small suburban villages of Stoneywood and Fankerton. For the next couple of miles the road runs along a ridge to the south of the river valley but presently it descends to cross the river at the narrow New Carron Bridge. Staying comparatively narrow, the road quickly passes the Carronbridge Hotel and climbs through the tiny settlement of Muirmill to reach the Forestry Commission car park which offers walks to a deserted medieval village. This lies just below the dam for the Carron Valley Reservoir, an interesting body of water that skirts the country's central watershed and so has a dam at both ends.
Running along the northern shore of the reservoir, the road is generally much wider and smoother than has been encountered so far, perhaps thanks to it having been improved when the reservoir was created. However, unlike many reservoir roads, there is little evidence here for the road having been moved for much of its length. However, towards the western end, the reservoir has flooded the original route and so the road has to follow a new course. This starts where the new road kinks inland around a slight bay, with a gate on the shore side across the old road line.
The B818 then reaches the end of the reservoir and crosses below the western dam into the valley of the Endrick Water. Back on its original course, the road follows the river downstream, crossing it at Gartcarron Bridge after a short run through forestry. Heading downhill now, the road becomes steadily narrower, and with ever tighter bends it becomes nearly impossible to maintain any speed and stay within the centre line. The further down you get, the narrower the road feels, hemmed in by steep banks and dry stone walls, but then suddenly the road turns sharp left, crosses Low Bridge and reaches a T-junction on the B822.
There is then a short multiplex west with the B822 to the pretty village of Fintry where the B822 forks right across the river and the B818 continues ahead; this does allow the B818 to widen to a proper S2 once more. As the B818 continues downstream the valley becomes wider and the river more meandering; the road therefore runs some distance to the south of the river. It continues across the fields and through the scattered community of Ballikinrain with the hills rising steeply to the left and the wide valley to the right. Road and river get steadily further away with each meander before the B818 comes to an end at a crooked crossroads on the A875 to the north of Killearn.
Originally the B818 started on the A803 in Camelon, to the west of Falkirk. It then headed northwest to Denny to pick up its current route, multiplexing along the B817 for a short distance en route. This had all become A883 by 1932.
At the western end the road originally crossed the Endrick Water at Clockburn, to the west of Fintry, before heading west through Balfron to Balfron Station, where it crossed the A81 before ending a short distance further on on the A811. Again by 1932, the A875 had been inaugurated and the B818 rerouted to meet this to the south of Balfron, with the old route being declassified.
Rather curiously, a little further down the same sheet, it is suggested that the B818 itself be renumbered throughout as part of an extended B905, taking that route out of zone. Why both of these proposals appear in their own right, rather than as a fully joined-up single number route is a mystery, but the proposal to renumber the B818 as B905 is marked 'No'!