Introduction
The character of North Wraxall parish is inseparable from its watercourses. Although relatively modest in size, the By Brook and its tributaries have influenced the parish’s boundaries, settlement pattern, agriculture, industry and ecology from prehistoric times to the present day. Flowing through the southern Cotswold limestone, these groundwater-fed streams have created a landscape of narrow valleys, permanent pasture, ancient woodland and water meadows that remains remarkably intact.
Today the principal waterways associated with the parish are the River By Brook, Doncombe Brook and Broadmead Brook, all of which form parts of the historic parish boundary.
Geology and Hydrology
North Wraxall lies upon the Great Oolite limestones of the southern Cotswolds. Rainwater readily infiltrates these porous rocks before emerging as springs along impermeable clay horizons lower down the valley sides. Consequently, the streams are characteristically clear, alkaline and relatively cool throughout the year.
This spring-fed regime produces comparatively stable flows, although prolonged dry summers can substantially reduce discharge. Historically, the limited volume of water restricted the operation of some mills to wetter periods of the year, a characteristic common throughout the By Brook catchment.
The River By Brook
The By Brook is the principal river associated with the parish. Rising on the Cotswold plateau, it flows southwards past Ford before continuing through Slaughterford, Box and Bathford to join the River Avon near Batheaston.
Within North Wraxall parish the river occupies an attractive limestone valley of permanent pasture, mature hedgerows and riverside woodland. The hamlet of Ford developed around one of the principal crossing points, from which it derives its name. Long before the construction of permanent bridges, the ford provided an important crossing on local routes linking Wiltshire with Gloucestershire.
The By Brook valley possesses considerable historic integrity. Stone bridges, traditional farmsteads, ancient field boundaries and surviving mill buildings combine to preserve much of the appearance recorded on eighteenth- and nineteenth-century maps.
Doncombe Brook and Broadmead Brook
The parish is further defined by two important tributaries.
Doncombe Brook forms much of the south-western boundary before joining the By Brook at Ford. To the north, Broadmead Brook forms the boundary with Nettleton and Castle Coombe parishes.
Watermills and Rural Industry
The streams supported a modest but economically significant milling industry for several centuries.
A tithe record of 1704 records three mills within North Wraxall parish:
- Doncombe Mill
- Ford Mill also known as Mercombe Mill
- Hennars (or Hennar’s) Mill also known as Wick Mill on the boundary of the parish (OS Map showing Wick Mill at the northern top of the parish)
Like many mills on the By Brook, these were principally corn mills, although documentary evidence suggests that at least Hennars Mill later functioned as a cloth mill before reverting to grinding grain during the nineteenth century. Throughout the By Brook valley, the medieval expansion of the Wiltshire woollen industry resulted in numerous corn mills being adapted for fulling cloth.
Unlike the larger rivers of Wiltshire, however, the By Brook’s relatively modest flow limited industrial development. Several mills were seasonal, operating only when sufficient water was available to power their wheels.
The 1871 Census demonstrates that milling remained an important local occupation well into the Victorian period. Doncombe Mill was occupied by Sarah Beaman, recorded as “Miller & Baker” as well as farming the land, together with two professional millers, illustrating how rural mills often combined several complementary trades.
Ecology
The streams support habitats typical of limestone rivers in southern England.
Characteristic wetland flora includes marsh marigold (Caltha palustris), opposite-leaved golden-saxifrage (Chrysosplenium oppositifolium), wild garlic (Allium ursinum), water forget-me-not (Myosotis scorpioides) and patches of water crowfoot (Ranunculus spp.) within the streams themselves.
The clean, well-oxygenated water supports brown trout (Salmo trutta), bullhead (Cottus gobio), brook lamprey (Lampetra planeri), the endangered White-clawed Crayfish, mayflies, caddisflies and stoneflies, all recognised indicators of high water quality.
These aquatic communities support birds including swallows, grey wagtail, kingfisher, dipper, grey heron and little egret, while bats frequently forage over the water during summer evenings.
Mammals and the Return of Native Species
Otters (Lutra lutra), once almost eliminated from southern England through pollution and persecution, have successfully recolonised much of the Bristol Avon catchment during recent decades. Although rarely observed because of their nocturnal habits, they are now considered established across many tributaries of the Avon. Deeper Green CIC maintain Doncombe Woods and otters have been seen on their cameras.
The Eurasian beaver (Castor fiber) represents a recent significant ecological development in the area. Beaver reintroduction projects have demonstrated the species’ ability to restore wetland habitats, reduce downstream flood peaks, trap sediment and improve biodiversity. Beavers within the wider By Brook catchment are generally believed to relate to escaped or unauthorised releases rather than to natural dispersal from the licensed reintroduction projects elsewhere in the Bristol Avon catchment. Natural History Museum reference link.The photos below, on private property beside the By Brook, show tree stumps which have obviously been gnawed by beavers:
Archaeological Context
Reliable water supplies have attracted settlement throughout the parish’s history. Near the eastern boundary lie both the Roman villa at Truckle Hill and the Roman religious complex at Nettleton, each positioned close to dependable springs and streams. Access to fresh water undoubtedly influenced the location of these sites, as it did medieval farms and later mills.
Watercourses also served practical administrative purposes. Medieval parish boundaries frequently followed rivers and streams because they formed permanent, easily recognised landscape features requiring little artificial maintenance. North Wraxall provides an excellent surviving example of this practice.
Ancient clapper bridge on the border with Castle Combe Parish:
Conclusion
The waterways of North Wraxall have played a central role in shaping the parish for over two millennia. They determined where people settled, where roads crossed the landscape, where mills operated and where wildlife flourished. Today these streams continue to define the parish’s character, preserving an exceptional combination of historic landscape, archaeological significance and ecological richness.
Further reading:
Dissertation by Sue Houlihan: Society in the Bybrook Valley
Selected References
Pevsner, N., and B. Cherry. The Buildings of England: Wiltshire. Harmondsworth: Penguin Books, 1975.
Wedlake, W. J. The Excavation of the Shrine of Apollo at Nettleton, Wiltshire, 1956–1971. Society of Antiquaries of London, 1982.
Wiltshire Council. Wiltshire Community History – North Wraxall. Wiltshire Community History
Bybrook River historical overview. Bybrook River history
The National Archives, RG10/1895, Census of England and Wales, 1871, Parish of North Wraxall, household of Sarah Beaman, Doncombe Mill.