Pont Ystumanner dates from the late 18th, repairs were carried out in 1811 and the construction of the present bridge suggests it was largely rebuilt at that time. Built of rubble stonework, the bridge has a depressed segmental arch of voussoirs set back below a regulating course, spanning 6.75m and rising 1.16m above the stream, carrying flush spandrels and a parapet coped with rubble slate. The carriageway is 4.6m wide plus parapets of 0.45m. In the west abutment is a small square flood culvert.

Reference: Cadw listed buildings database.