Tarth Bridge carries the B7059 across the Tarth Water a short distance above its confluence with the Lyne Water. The bridge is quite a prominent feature from the A72 which terminates the B7059 on the south bank of the river at a steeply raked triangular junction, climbing the river bank. The bridge itself has a single stone arch spanning the river, with a much smaller arch towards the northern end of the north approach, perhaps intended as a sheep creep or flood arch. This northern approach is ramped, with the south bank sitting considerably higher. The parapets are angled to accommodate this ramp, rising from the north bank before levelling off over the centre of the arch. Despite this, however, and probably as a result of rebuilding the road itself, the road appears to have a fairly steady gradient, with the parapets notably taller on the north bank than the south. The road across the bridge is a wide single lane, which on the south bank branches into two narrow S2 carriageways turned to meet the A72 at acute angles.
