MSO12577 - Mill leat northwest of Tarr Steps (Monument)

Summary

A contour leat runs from North Barton Wood nearly as far as Tarr Steps. It comprises a well defined channel 1.2 m wide and 0.4 m deep. It may have served a grist mill.

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Type and Period (3)

Protected Status

  • None recorded

Full Description

A water meadow of probable 19th century date is visible on aerial photographs as earthworks on the western slopes of the Barle valley, in an area enclosed by North Barton Wood centred at circa SS 86173247. This is a type of water meadow known as catchwork or field-gutter system, commonly found on combe or hill slopes and designed to irrigate pasture by diverting water from a spring or stream. The water is carried along the valley sides via one or more channels or gutters and when irrigation was required the gutters were blocked, causing water to overflow from gutter to gutter, thereby irrigating the slopes. This film of water prevented the ground freezing during the winter and raised the temperature of the grass in the spring, thereby encouraging early growth, particularly important during the hungry gap of March and April. One gutter is clearly visible, roughly following the contours of the east-facing combe slope, although it now appears to be in use as a footpath as marked on the current Ordnance Survey base map. A second gutter may be located downslope but was not clear enough to be transcribed. The marked course of footpath, continuing through the woodland to north-west and south-east, may reflect the course of the original gutter. [1-3] The remains of a contour leat are followed by the footpath on the west bank of the Barle at this location. [4] A contour leat runs from North Barton Wood nearly as far as Tarr Steps. It comprises a well defined channel 1.2 m wide and 0.4 m deep. Close to Tarr Steps the leat meets the top of a rock outcrop at SS 8672 3215. Water within the leat was clearly intended to issue over this outcrop in a cascade before continuing at a lower level to meet a second outcrop a little to the south. A similar arrangement exists here. After the second outcrop the leat is visible as a shallow channel running along the valley side only 2 or 3 m above the river level. It ends in a quarried area beside Tarr Steps. The date of the leats and cascades is uncertain. Part of the leat is depicted on First Edition Ordnance Survey mapping of 1890 [2], but local information (Josie Floyd, Brendon parish) recalls the leats having been dug (or possibly cleaned out) in the 1920s or 1930s (pers comm). [5] A weir is indicated at the take off point for the leat on the First Edition Ordnance Survey mapping of 1890. [2] The circular footpath from Tarr Steps to foot bridge across the Barle near Westwater Copse crosses the leat in a number of places and runs above it in sections from SS85953258 to about SS86453239. [6] A study of Tarr Steps and its environs in 2013 suggested that the leat supplied a grist mill for the local population. It is described as taking water from West Water, 100m above its confluence with the Barle (and a more stable supply), and running for some 1.5 kilometres. It can be traced as an infilled channel, 0.8 metres wide, with evidence of a stone lining along much of its course, cut into the hillside to a depth of 1.3 metres, with a substantial revetment bank, 0.8 metres wide, on its downslope side. The resulting height of the leat ensures that it is above the floods but also means it has to flow down two large rock outcrops that are unusual features. Field evidence suggests it was constructed prior to a boundary bank constructed between 1841 and 1882-88. [7]

Sources/Archives (7)

  • <1> Aerial photograph: Various. Various. Vertical Aerial Photograph. NMR RAF 106G/UK/1655 4259-60 11-JUL-1946.
  • <2> Map: Ordnance Survey. 1868-1901. County Series; 1st Edition 25 Inch Map. 1:2500. 1890.
  • <3> Monograph: Cook, H. + Williamson, T.. 2007. Water Meadows: History, Ecology and Conservation. Windgather Press. 1st Edition. 1-7, 28-9.
  • <4> Unassigned: Webster, CJ. June 1998. Somerset CC staff comments.
  • <5> Verbal communication: Various. Various. ENPA archaeologist field visit. Josie Floyd, personal communication.
  • <6> Verbal communication: Various. Various. Oral Information or Staff Comments. Site visit re proposed repairs to path 20 April 2013.
  • <7> Report: Riley, H.. 2013. An historical and archaeological study of Tarr Steps, Exmoor National Park: Project report. 1, 10-11.

Map

Location

Grid reference Centred SS 8628 3236 (858m by 431m)
Map sheet SS83SE
Civil Parish WITHYPOOL AND HAWKRIDGE, WEST SOMERSET, SOMERSET

Finds (0)

Related Monuments/Buildings (1)

Related Events/Activities (1)

External Links (1)

Other Statuses/References

  • Exmoor National Park HER Number (now deleted): MMO3136
  • National Monuments Record reference: SS 83 SE90
  • National Park: Exmoor National Park
  • Pastscape HOBID (was Monarch UID): 1490668
  • Somerset SMR PRN: 35785

Record last edited

Nov 20 2013 1:33PM

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