We have almost completed the upgrade works. Aqua Metro Services, on behalf of Melbourne Water, are upgrading Dights Falls fishway. Works began in March 2019 and we anticipate that it will be completed by early August 2019.
We regularly review the function of weirs and fishways. Dights Falls weir was built in 1895 and today plays an important role in controlling water levels in the Yarra River – pooling water for approximately 17 kilometres upstream and protecting important social, economic and environmental values of the river. In 2012 Dights Falls weir underwent an upgrade to improve the weir structure and additionally construct a fishway, to help support Victoria’s native fish migration. After the review of the function of Dights Falls it was identified, to further improve the efficiency of the Dights Falls fishway, a secondary entry point is required.
Why is the work happening?
Studies have found that Victoria’s native fish are more sensitive to high flows in a river or stream. During high flows the water can be too turbulent for the fish to swim upstream. In order to help support the native fish populations in Yarra River, the upgrade will provide a new second entry that provides a less turbulent access point.
The majority of Victoria’s native freshwater and coastal fish species need to undertake some form of migration during their lifecycle. Fish passage upstream is critical in supporting many of these Australian native fish species as it allows:
- Adult fish to move to and from spawning habitats
- Juvenile fish to disperse to new habitats
- Access to feeding grounds
- Re-colonisation of new habitats
- Exploratory movements and habitat selection,
- Access to and from refuge areas during droughts or floods.
What is a fishway?
Fishways (or fish ladders) are simple structures that are commonly used in Victoria to allow fish to pass man-made structures such as weirs, dams, floodgates and roads.
The upgrade to Dights Falls fishway will increase the number of native fish using the fishway and ensure during high flows in the Yarra River the fish can still migrate.
We anticipate these works will take up to four months to complete. We are working in partnership with City of Yarra and Wurundjeri to undertake this upgrade.
For more information about this project or our other activities please call Melbourne Water on 1800 560 622