Loch Migdale Crannog

A low stony island in Loch Migdale may preserve waterlogged timbers and organic remains from a defended dwelling and its later reuse.

Quick facts

Date
Probably later prehistoric; later reuse possible
Architect / designer
Unknown
Type
Artificial or enlarged island settlement
Designation
Scheduled monument (SM10917)
OS grid reference
NH 62596 91589

Architecture, archaeology and continuing use

The crannog is a mound of stones about twenty metres across, normally rising only a few tenths of a metre above the water. It sits partly on a natural shallowing near the western shore. Official scheduling found no visible causeway, while later underwater work reported evidence for one below water.

Its story

The monument is probably later prehistoric, though reuse into medieval or post-medieval times is possible. A tradition places occupation as late as 1630. Underwater investigation in 2003 recovered structural evidence and confirmed the artificial-island character.

Why it is included

Scheduling recognises a strong field example with exceptional potential for waterlogged evidence about construction, economy and long-term occupation.

What to notice

  • A low stony profile changing with the water level.
  • The shallow loch bed between island and shore.
  • How the site controls views and movement near the loch’s western end.

Reading the surroundings

Do not wade, swim, boat onto or disturb the crannog. Water depth, cold, submerged material and protected deposits make unsupervised approach unsafe and damaging.

Timeline

  1. Later prehistory (probable) People created or enlarged an island for settlement.
  2. Until 1630 (tradition) Later memory associated the islet with prolonged occupation.
  3. 2003 Underwater excavation examined timbers and a possible submerged causeway.
  4. 2004 The nationally important loch-bed context received scheduling.

What we know — and what remains uncertain

The first construction date and the 1630 tradition remain unproven; accounts differ over whether a causeway is visible or survives underwater.

Sources & further reading

Location

reviewed Scotland’s Architecture record small badge = designation

OS grid reference NH 62596 91589 · Location confidence: High: the national designation supplies an official mapped National Grid Reference; an additional source confirms the Place relationship, history or current identity. · Select the marker to open its satellite view in Google Maps. On desktop, drag Pegman (the yellow figure) onto a blue road. On mobile, turn on the Street View layer and tap a blue road. Other photo markers may be user-contributed.

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Place: Bonar Bridge · Current use: Protected archaeological site in a loch; no formal visitor access or safe approach is confirmed (checked 2026-08-27)

Last reviewed: 2026-08-27 · Record: SHD-REC-BBR-LOCH-MIGDALE-CRANNOG

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