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Trapezoidal fishway

Trapezoidal fishway

Trapezoidal fishway, Wyong River, New South Wales Photo by Tim Marsden

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Disclaimer: In addition to the standard disclaimer located at the bottom of the page, please note the Fishways (biopassage structures) disclaimer.

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Trapezoidal fishways are relatively untested in Australia. Trapezoidal fishways have been used for fish passage in North America and recently in New South Wales and South Australia, following extensive physical and computer modelling[2].

Trapezoidal fishways are like a pool-type fishway with a straight channel divided into pools with weirs. Many trapezoidal fishways are modified vertical slot fishways. The goal of the new trapezoidal fishway is to separate the migration corridor from the energy dissipation zone to ensure a low turbulence, vortex free area, which improves upstream migration performance[1].

A trapezoidal fishway was installed at the low entrance to the Loudoun Weir vertical-slot fishway on the Condamine River Queensland[2].


  1. ^ Bung, D (2018), Hybrid Investigation on the Hydraulic Performance of a New Trapezoidal Fishway. [online] Available at: [Accessed 11 November 2020].
  2. ^ a b O’Connor, J, Stuart, I & Mallen-Cooper, M (2015), 'Performance, operation and maintenance guidelines for fishways and fish passage works', Trove. [online] Available at: [Accessed 10 November 2020].

Last updated: 10 May 2021

This page should be cited as:

Department of Environment, Science and Innovation, Queensland (2021) Trapezoidal fishway, WetlandInfo website, accessed 25 June 2024. Available at:

Queensland Government
WetlandInfo   —   Department of Environment, Science and Innovation