|Location Map ( geo)|
|Distance:||13.7 miles (22 km)|
|Route outline (key)|
The B740 crosses the Crawick Pass through the Lowther Hills in southern Scotland.
It starts on the A76 to the north of Sanquhar, at traffic lights which also serve to control traffic crossing the adjacent narrow bridge where the A76 crosses the Crawick Water. The B740 heads upstream along the valley of this stream, soon going under the Carlisle to Kilmarnock railway line.
The road continues up the valley, which is winding but not particularly narrow. Apart from a few scattered houses there are no settlements on this section of the road. As the road continues the terrain becomes bleaker and the valley narrower. The stream, still fairly wide, is now easily visible from the road. Eventually a tributary, the Spango Water, is crossed. The valley now begins to peter out and the road enters open moorland.
The road contours around the edge of a hill before reaching the next valley, of the Duneaton Water. The stream is crossed early on and then the valley is followed downstream although the road appears to keep out of the valley bottom. After skirting Mountherick Hill the road enters the village of Crawfordjohn. It climbs through the village and turns away from the river valley. It goes over the top of a hill, actually reaching a higher altitude than in the pass earlier, before descending to cross the Black Burn.
The road ends a few hundred yards further on, at a T-junction on the B7078. This road used to be the dual-carriageway A74; when it was downgraded following the construction of the parallel M74 it was also singled. The former northbound carriageway, which is crossed to reach the T-junction, is still partly in existence at this point as a parallel cycle path.