Collaboration | Environment|
Country's largest
fish pass opens
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Jackson has completed work on the country’s largest fish pass, located on the River Trent at Colwick Country Park in Nottingham.
The fish pass, which is 200m long, 6m deep and 6.5m wide, was constructed on behalf of the Environment Agency and will enable scores of fish species to swim around the giant Holme Sluices structure and reach spawning and feeding grounds further up the Trent. Species such as salmon, trout and eel will benefit from the £12m project.
The pass took two years to construct and is part of the Environment Agency’s work to improve fish passage across the country. It includes a two-metre-high fully automated radial gate which monitors the water levels and flow rates in the River Trent. The pass will then open and close based on the varying water levels throughout the year.
Chambers
It is divided into 20 ascending chambers into which water flows through narrow slots. Fish of all species swimming upstream to lay their eggs in the gravel riverbeds of the Trent tributaries such as the River Dove and the River Derwent will be able to pass through these slots and rest in the chamber above before continuing.
The project also includes an eel pass to help support the critically endangered European eel. There is also a public viewing platform above the water with visual interpretation boards to visitors about the wildlife in and around the river, including the fish that are expected to use the pass.
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'The fish pass will open up the River Trent for all fish species and is the first scheme of the ambitious Trent Gateway Partnership which aims to remove all barriers to fish migration along the River Trent - the third longest river in the country.'

Simon Ward, Fisheries Technical Specialist at the Environment Agency
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