Fish Passes

Fish passes are installed to help salmon, sea trout, brown trout and eels get past weirs. They can take many different forms ranging from simple timber ‘easements’ to technical Larinier passes that use steel baffle plates to slow the flow. Eel passes can include sections of ‘bristle board’ and plastic plates with raised studs.

Riverworks have experience of the full range of fish pass techniques and able to design and build very cost-effective solutions.


What we offer

Riverworks is able to offer a complete design and build service, or can be commissioned to explore options and present recommendations.

Pete Kerr, the Director of Riverworks, is a Chartered Civil Engineer and has 25 years of experience of designing and building fish passes across the UK. We can offer timber easements, rock ramps, pool and traverse passes, Lariniers, denil passes and all forms of eel pass. We can also offer solutions suitable for coarse fish and full weir removal works.

Through working with local contractors and suppliers, Riverworks can deliver very cost effective solutions in the full range of circumstances.

Examples delivered by Riverworks include: Fish passes at Oliver's Mill, South Low and Peebles, a smolt trap at Galashiels and designs for a fish pass on the River Aln. 

Our services

  • Initial discussion of options and concept design
  • Detailed design and permissions for works
  • Bringing in experienced contractors to construct as part of a design-build approach
  • Leading groups of volunteers to deliver easements
  • Project management
  • Health and safety management including CDM requirements
  • Close discussions to ensure successful delivery
  • Maintenance of completed passes