Large Woody Structures

LWS can quickly improve geomorphology, flows, spawning and fish habitat. They are a very useful but expensive fix. However, their use requires experienced surveyors and contractors and approval by SEPA.

River Don Restoration

We installed 16 Large Wood Structures (LWS) along the main stem of the River Don to revitalise the aquatic ecosystem. These natural features create essential shelter, stabilise the riverbed, and restore the ideal spawning conditions needed for wild salmon and trout to thrive.

MEDIAL Structure in centre of flow

Why it’s important:

  • Diversifies Flow: It stops the river from becoming a uniform, shallow “canal.”
  • Habitat Creation: Provides refuge for salmon and trout away from the strongest currents.
  • Oxygenation: Naturally aerates the water, improving overall river health.

Bar Apex Structure anchored into bank

Why it’s important:

  • Stabilises Banks: Anchors the river edge to prevent land loss during high-flow events.
  • Scours Deep Pools: Naturally carves out deeper channels, providing cool, safe refuges for fish.
  • Sediment Management: Helps organise gravel and silt to maintain clean spawning beds.

CBEC Project

These 128 logs from Ardhuncart were used on the project below, also on the Don as a wider catchment project.
In collaboration with CBEC Eco-Engineering, Ardhuncart Estate is implementing a targeted restoration project along the River Don. Following a comprehensive geomorphological survey that identified 43 potential sites, we have shortlisted 17 strategic locations for the installation of Large Wood Structures (LWS).