The reservoir was built during the early decades of the 20th century to store and supply ground water via the Leechmere Road Pumping Station to the Hendon Paper Mill (HER 16627). This reservoir was part of a series which supplied the paper mill with fresh water. Cartographic evidence indicates a construction date between 1914 and 1940 with a tighter date range of 1923 - 1939 coinciding with rebuilding of the mill during this period.

A series of gullies were excavated as part of a larger excavation. One contained a flint fragment and a charred heather twig returned a radiocarbon date of cal AD 260-430.The gullies were tentatively interpreted as a rectilinear enclosure.
Excavation was undertaken in 2021 and post-excavation analysis was undertaken in 2023 (event 5467 report 2023/34).

A series of ditches and gullies were excavated as part of a larger excavation. A boundary ditch aligned approximately northwest-southeast and continuing to the northwest was identified initially by geophysical survey and trial trenching. The palaeoenvironmental assemblage indicated a late prehistoric or Romano-British date and a fragment of birch charcoal gave a radiocarbon date of 390-200 cal BC. Another ditch intersected with it and there were a series of gullies to the northwest, one of which produced a piece of alder charcoal which gave a radiocarbon date of 540-390 cal BC. An oval
enclosure ditch in the northwestern part of the site was only partially excavated in a trial trench.
Excavation was undertaken in 2021 and post-excavation analysis was undertaken in 2023 (event 5467 report 2023/34).

Two pits dated to the Bronze Age were excavated as part of a larger excavation. One contained crumbs of probable prehistoric pottery and three flints, and a charred hazel nutshell gave a radiocarbon date of 2140-1940 cal BC. The other gave a radiocarbon date of 1430-1290 cal BC from a charred barley grain.
Excavation was undertaken in 2021 and post-excavation analysis was undertaken in 2023 (event 5467 report 2023/34).

This structure was subject to historic building recording in 2021 prior to the demolition of Sunderland Civic Centre (event 5462 report 2022/88). It was constructed in shuttered concrete during the main works for the Civic Centre in order to house the NER Penshaw Branch which dated to 1852 (HER2659). The easternmost section was constructed of coursed limestone masonry. The line originally served the South Dock (HER2874), and here ran through a cutting: it was closed in 1984. The tunnel was c187 m long and had four pedestrian refuges on each side.

This structure was subject to historic building recording in 2021 prior to the demolition of Sunderland Civic Centre (event 5462 report 2022/88). It was constructed as part of the Sunderland Civic Centre as a sub-basement, but was adapted as a nuclear bunker in the 1970s. It was a subterranean structure 32 m by 7 m made of concrete shuttering and close-set steel sheets, with an entrance in the northeast face of the northernmost hexagon of the Civic Centre complex. It was equipped with a ventilation system and toilets.

Grange Farm is shown on the Ordnance Survey First Edition map as a linear range of buildings on the west side of Stockton Road, just south of the point where it crosses the line of the NER Penshaw Branch (HER2659). The southernmost building in the range is labelled as a 'Warehouse' on the 1:500 town plan, suggesting that the agricultural function of the farm was reducing. To the southeast lay 'The Grange' and the attached 'Grange School'. In the mid 19th century the area was gradually being developed for housing and Grange Farm had gone by the late 19th century.

'Mill Dam' is shown on the Ordnance Survey First Edition map leading northeast from Herrington Mill (HER3124) and running parallel to Herrington Burn to the northwest which fed it. It is not shown on subsequent editions.

St Mary's Vicarage is first shown on the Second Edition Ordnance Survey map and was presumably built to serve the Church of St. Simon to the west which was built in 1879-80 (HER8125), although the names do not correspond. It was set in the centre of a large plot with a carriage drive to the front.
On the Third Edition Ordnance Survey map it is named as Simonside House, and a number of small buildings have been added to the side and rear. It was demolished c1939 to make way for the Simonside Arms (HER19086).

The Simonside Arms was constructed in brick in 1939 to designs by T.A. Page son and Bradbury, in an Art Deco style. It appears on the 1947 Ordnance Survey 25 inch map as a two storey building with 5 bays to the front and a single storey wing on either side which wrapped around the back of the building. Extensions were subsequently added to the rear during the 20th century. It was subject to photographic recording of the exterior in 2023 (event 5454 report 2023/30).