The Blacklinn Bridge crosses the River Devon in the picturesque Glen Devon. After a straight, wide route up the side of Castlehill Reservoir, the A823 narrows as it enters trees, and then shortly after 30 limit signs it twists sharp right over the bridge, before immediately turning back to the left on the eastern bank. Due to the confines of the glen there is little opportunity to remove this sharp double bend without constructing a new skew bridge over the river.
Built in 1836, the bridge is a single stone arch across the river. Lightly decorated with a string course across the top of the key stones - roughly at road level, and another higher up the parapet which hints at the parapet being raised at some point, the sides of the bridge also seem to taper back. The parapets incorporate significant flared curves on either side of the bridge, although the modern road curves tight against them as it swings across the river. The roadway is a narrow S2, but without footways.
