Druidibeag Causeway carries the B890 across the northern tip of the vast and amorphous Loch Druidibeag on South Uist. It is a short causeway cutting off a small pool of water, begging the question of why a causeway was constructed instead of taking the road around the shore to the north. The causeway is marked on maps from the late 1800s, proving its age, and appears to have been built by piling rocks into the shallow water and then building a road surface across the top. The northern side of the causeway has silted up, with a wide grassy verge stretching down to the waters edge, while the southern side retains a rocky bank, although perhaps more modern and added as protection for the road. There is no obvious culvert connecting the two parts of the loch, but doubtless there is either a submerged pipe, or water can filter through the rock foundations.
