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Home | Sevenacres Weir Barrier to Fish Migration

Covanburn Projects

Sevenacres Weir Barrier to Fish Migration

Client Ayrshire Rivers Trust
Value £225,000
Location Ayrshire


Installation of a new fish pass

The Sevenacres Weir in Ayrshire was, at two metres high, a significant obstacle for fish migration. The solution was to install a new fish pass.

This work needed detailed coordination in order to deliver plant and materials, as access to and from the site was limited.


The project was located on the Lugton Water River, near Kilwinning and consisted of the construction of a Larinier fish pass, one of the most common types of design, along the right bank of the Lugton Water to provide passage to migratory salmonids and non-migratory trout past the Sevenacres Weir.

Initially, Covanburn conducted ground investigation work to confirm bedrock level in the river channel, before the installation of temporary works to divert river flows whilst work was being carried out.

The key actions carried out by Covanburn were:

  • Excavation of the river bank and bed
  • Construction of reinforced concrete base and walls of the fish pass
  • Placement of rock armour scour protection to the riverbank
  • Installation of fish pass baffles within reinforced concrete channel
  • Backfill and reinstatement of area, including the installation of security screens, an open-mesh walkway, access steps, guardrails and fencing

The works were overseen by the Ayrshire Rivers Trust (ART), SEPA and the designers, in order to ensure compliance with the approved Environmental Risk Assessment.


The fish pass at Sevenacres Weir provided improved fish passage for the first time in several decades. The weir has been in place for around 160 years and, now has a fish pass that will allow salmon and trout to migrate up and downstream without too much difficulty.


4 months duration
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