Iron Bridge, Approximately 275 Metres South of Marks Hall Cottages

The Iron Bridge, located approximately 275 metres south of Marks Hall Cottages, is a garden bridge dating from around 1800. It is constructed of red brick with limestone copings and features cast iron railings. The bridge spans an estate road from east to west across Robin's Brook, measuring about 4.50 metres in width and approximately 10 metres in overall length.

It has a semi-circular arch, which is damaged on the north side, and a segmental coping made of plain stone slabs. The cast iron railings consist of six large sections over the bridge and two straight sections on the road approaches, which are jointed together and sealed with lead. At the time of the survey in March 1987, the northeast straight section was dismounted and damaged, while the southwest straight section was missing. The railings over the bridge have a radial design with a central boss, while the straight sections feature crossed diagonals, with three plain vertical bars between the sections and two at each end.

The handrail is adorned with urn finials, of which two are complete and one is damaged on the north side, along with another damaged finial on the south side. These finials are mounted in square mortices and sealed with lead. The bosses, designed as lion's heads, are sealed with lead into iron rings. On the north (inner) side of the south railing, all six bosses are intact; on the south side of the same railing, five bosses are present, with all but one cracked. On the south (inner) side of the north railing, there are two intact bosses and two damaged ones; on the north side of this railing, there are four bosses.

The carriageway and approaches were covered with concrete for wartime use, which could potentially be removed. South of the bridge, the river channel is bordered by two brick walls with sloping stone copings that end in square piers, each topped with a plain spiked railing supported by three stirrup stays. The bridge is reinforced with three iron ties featuring simple roundels and square nuts at each end, and there is a brick dam across the north arch.