Description

The monument comprises the remains of a crannog, an artificial island, which archaeological excavation has shown dates to the early Neolithic (3640-3360 BC) and Middle Bronze Age (1600-1200 BC) with evidence for Iron Age (800BC-AD400) re-use. It survives as a partially submerged timber and stone built island measuring about 23m in diameter. The monument lies within Loch Bhorghastail, at about 50m above sea level. A submerged causeway, measuring about 35m in length, extends from the northwest of the island, connecting it to the shore. The crannog is annotated as a cairn on Ordnance Survey mapping. 

The crannog survives as a stone-built islet with submerged timber elements. The earliest phase is a broadly circular timber platform, now submerged, measuring about 23m in diameter. It is formed of willow and birch logs laid directly onto the loch bed silts with large stones placed on top of the timbers, probably to weight them down. There is a probable revetment on the eastern, deeper water, side of the crannog. A brushwood layer was added to the western side of the islet during the Middle Bronze Age and the stones moved to create the stone islet visible today. The causeway extends to the shore and is probably contemporary with the earliest phases of this site. Later re-use is demonstrated in the form of a pit and area of burning dating to the Iron Age.

The scheduled area is irregular. It includes the remains described above and an area around within which evidence relating to the monument's construction, use and abandonment is expected to survive, as shown in red on the accompanying map. The above ground elements of the post and wire fence at the western end of the causeway is excluded to allow for its maintenance.

Source: Historic Environment Scotland

Statement of Scheduling

The national importance of the monument is demonstrated in the following way(s) (see Designations Policy and Selection Guidance, Annex 1, para 17): a.   The monument is of national importance because it makes a significant contribution to our understanding or appreciation of the past, or has the potential to do so as a crannog dating to the early Neolithic and Middle Bronze Age. It adds to our understanding of early Neolithic and Bronze Age monumentality and communal practice, and the long-term significance of place.b.   The monument retains structural, architectural, decorative or other physical attributes which make a significant contribution to our understanding or appreciation of the past. In particular, there is significant potential for the survival of buried archaeological deposits, including waterlogged remains. Study of the form and construction techniques of the monument has the potential to increase our understanding of this monument and similar monuments elsewhere.c.   The monument is a rare example of a crannog constructed and used in the early Neolithic and Middle Bronze Age. It is currently only one of only 11 known examples of this date in Scotland.d.   The monument is a particularly good example of a Neolithic and Bronze Age crannog and is therefore an important representative of this monument typee.   The monument has research potential which could significantly contribute to our understanding or appreciation of the past. It is of significant archaeological interest. It can help us understand Neolithic and Bronze Age communal practices and belief, the role of lochs and other water bodies in the beliefs and values of prehistoric communities, as well as long term importance of place.f.   The monument makes a significant contribution to today's landscape and our understanding of the historic landscape. It formed an important part of the prehistoric landscape. It remains a significant feature in the landscape today.

Assessment of Cultural Significance

This statement of national importance has been informed by the following assessment of cultural significance:Intrinsic characteristics (how the remains of a site or place contribute to our knowledge of the past)The monument is the remains of a crannog, surviving as a timber and stone built structure. The plan and phasing of the monument is clear and understandable. Small-scale excavation has revealed evidence of construction and use from the early Neolithic to the Iron Age. The earliest phases survive as a submerged timber platform, created in the early Neolithic and dated to 3640-3360 BC. During the Middle Bronze Age, the platform was augmented with layers of brushwood and stones were added to the western side to create a smaller stone-built island. Re-use in the Iron Age is indicated by a pit and evidence of burning. The overlying peat layer has produced dates of 900-1030 AD, giving a date to the end of activity at the site. The crannog is connected to the shore by a stone causeway which extends from the northwest of the island.

The function of the crannog is uncertain and no evidence for settlement has been recovered. However, considerable effort and resources would have been required to build and maintain the site. Large quantities of pottery, some with surviving food residue, and worked stone have been found on and around the monument. Together this suggests it may have been used for communal activities, such as cooking or feasting.

The excavations at Loch Bhorghastail indicate there is good potential for the survival of archaeological deposits, including waterlogged deposits, artefacts and environmental remains relating to all phases of the construction and use of this site. The archaeological deposits have the potential to provide information about the function and development of the monument over time as well as more precise dating. Study of the monument can tell us about communal practices and belief in prehistory as well as contemporary economy, land-use and environment. Study of the form and construction techniques of monument, compared with crannogs elsewhere, would enhance our understanding of the development sequence of this site and of prehistoric crannogs in general.Contextual characteristics (how a site or place relates to its surroundings and/or to our existing knowledge of the past)Crannogs of Neolithic and Bronze Age date are uncommon with only 11 confirmed examples, all in the Western Isles. Confirmed examples include Loch Langabhat (NRHE ID 270908), Loch an Duin (SM3264; NRHE ID 4092) and Loch Marabhat (SM13820; NRHE ID 370585), all on the Isle of Lewis. They appear to have originated in the early Neolithic and substantial quantities of prehistoric pottery and worked stone have been recovered from the loch beds around many of these sites. There is potential to study these sites together to better understand their functions within local communities and possible chronological development in the area.

As an artificial island, the monument occupies a prominent position in the landscape and would have been an important component of the wider prehistoric landscape of settlement, agriculture and ritual. Its position within a loch and evidence for communal activities such as feasting suggests that such watery locations may have held particular significance for prehistoric communities.

The monument therefore has the potential to enhance our understanding of community, society and belief during prehistory. Study of the monument in relation to similarly dated crannog sites can enhance our understanding of Neolithic and Bronze Age monumentality, belief and communal activities such as feasting. It has the potential to enhance our understanding of the long-term use and re-use of place and the role of water and lochs in the beliefs and values of communities in prehistory.Associative characteristics (how a site or place relates to people, events, and/or historic and social movements)There are no known associative characteristics that contribute to this monument's national importance.

Source: Historic Environment Scotland

Sources

Bibliography

Historic Environment Scotland https://www.trove.scot/place reference number NRHE ID 359072 (accessed on 29/06/2026).

Local Authority HER/SMR Reference MWE150042 (accessed on 29/06/2026).

Blankshein, S., Gannon, A., Garrow, D. and Sturt, F. 2023 Neolithic crannogs in the Outer Hebrides (and beyond?): synthesis, survey, and dating. Proceedings of the Prehistoric Society 89, pp. 225-247.

Blankshein, S., Garrow, D. and Sturt, F. 2023 Excavation and survey at Loch Bhorgastail, Isle of Lewis, Outer Hebrides (July 2023). Interim report. https://doi.org/10.5284/1100101. [accessed on 29/06/2026]

Blankshein S, Pedrotti F, Sturt F, Garrow D. 2026 At the Water's Edge: Photogrammetry in Extreme Shallow-Water Environments. Advances in Archaeological Practice. Published online 2026:1-16. doi:10.1017/aap.2025.10145. [accessed on 29/06/2026]

Garrow, D. and Sturt, F. 2019 Neolithic crannogs: rethinking settlement, monumentality and deposition in the Oter Hebrides and beyond. Antiquity 93 369, pp. 664-684. DOI https://doi.org/10.15184/aqy.2019.41 [accessed on 29/06/2026]

trove.scot

https://www.trove.scot/place/359072/

HER/SMR Reference

https://her.cne-siar.gov.uk/Monument/MWE150042

Source: Historic Environment Scotland